Robin Williams Dead at 63 -- Hollywood Reacts

Hollywood is in mourning after the shocking death of Robin Williams.

Between his costars through the years and a generation of celebrity fans who grew up on films like "Jumanji," "Hook," "Mrs. Doubtfire" and "Aladdin," the late actor's many admirers have all taken to Twitter to remember him and share their condolences.

See Ben Stiller's Touching Tribute to Robin Williams

President Barack Obama also offered his condolences in a sweet statement, saying "Robin Williams was an airman, a doctor, a genie, a nanny, a president, a professor, a bangarang Peter Pan, and everything in between. But he was one of a kind. He arrived in our lives as an alien - but he ended up touching every element of the human spirit. He made us laugh. He made us cry. He gave his immeasurable talent freely and generously to those who needed it most - from our troops stationed abroad to the marginalized on our own streets. The Obama family offers our condolences to Robin's family, his friends and everyone who found their voice and their verse thanks to Robin Williams."

"Mork & Mindy" costar Pam Dawber added "I am completely and totally devastated. What more can be said?"

And Sarah Michelle Gellar, who just starred alongside him on CBS' "The Crazy Ones," released a statement of her own. "This is without question, the hardest few words I have ever tried to write. My life is a better place because I knew Robin Williams. To my children he was 'Uncle Robin', to everyone he worked with, he was the best boss anyone had ever known, and to me he was not just an inspiration but he was the Father I had always dreamed of having."

PHOTO: See Robin's Heartbreaking Final Instagram Post

Robin Williams' "Mrs. Doubtfire" Costars Remember Their Movie Father

We'll continue to update as new tweets come in ...

Sad, sad, day... My condolences to Robin’s family. He brought light to every room he entered & was a true comedic genius. #RIPRW
— Jennifer Lopez (@JLo) August 12, 2014

I could not be more stunned by the loss of Robin Williams, mensch, great talent, acting partner, genuine soul.
— Steve Martin (@SteveMartinToGo) August 11, 2014

@SteveMartinToGo a brilliant man and comedian. The acting community has suffered another tragic loss ! #OscarWinner #legend
— Faye Dunaway (@RealFayeDunaway) August 11, 2014

Very sad, very upset, very glad I did not have to hear about this though Twitter. Probably going to be taking some time off it for a while.
— Mara Wilson (@MaraWritesStuff) August 11, 2014

Robin Williams made the world laugh & think. I will remember & honor that. A great man, artist and friend. I will miss him beyond measure.
— Kevin Spacey (@KevinSpacey) August 12, 2014

Horrible news-BBC News - US actor Robin Williams found dead http://t.co/roaI7it7vI
— Patricia Arquette (@PattyArquette) August 11, 2014

RIP to one of the greatest comedic and dramatic actors of our time. We will miss you. #NaNuNaNu
— Jenny McCarthy (@JennyMcCarthy) August 11, 2014

I met this sweet, generous & brilliant man Robin Williams in 1991. Here we are with HIS idol Jonathan… http://t.co/wJOFig7Bzp
— Kathy Griffin (@kathygriffin) August 11, 2014

Wow, so shocked and sad to hear about Robin Williams. One of the greats. #RIPRobinWilliams
— Maitland Ward Baxter (@MaitlandWard) August 11, 2014

Shocked to hear the news about Robin Williams. RIP
— LuAnn de Lesseps (@CountessLuAnn) August 11, 2014

Robin Williams is someone I have always deeply respected, been inspired by, & learned from as an artist. I'm devastated. RIP.
— Lindsey Haun (@HaunSoloProject) August 11, 2014

Oh Jesus I am crushed to hear about Robin Williams' passing. So fucking sad and surreal. Just awful.
— Chris Hardwick (@nerdist) August 11, 2014

So sad to hear the news about Robin Williams. Just shocked. Pure #Genius. The laughs are tears and prayers to his Family. #RIP
— David Boreanaz (@David_Boreanaz) August 11, 2014

Ah Robin, I'm so sorry the earth couldn't stay worthy of you. Hope happiness awaits you.
— jason alexander (@IJasonAlexander) August 11, 2014

Beyond Devestating.... RIP Robin Williams
— soleil moon frye (@moonfrye) August 11, 2014

What a devastating loss in talent. They say @robinwilliams was suffering from depression. Like so many real artists do. #RobinWilliams #RIP
— Sonja Morgan (@SonjatMorgan) August 11, 2014

The only time I met Robin Williams, I got to tell him how much I loved 'World's Greatest Dad'. Do see that one. One of his many great roles.
— edgarwright (@edgarwright) August 11, 2014

No! Robin Williams you were so loved.
— mia farrow (@MiaFarrow) August 11, 2014

One of the best comedic actors of all time is gone . RIP Robin Williams. I can't believe it
— Vinny Guadagnino (@VINNYGUADAGNINO) August 11, 2014

RIP Robin Williams. You will be missed but never forgotten. #Legend #JuilliardAlum http://t.co/5oHV3hFPFb
— Danielle Brooks (@thedanieb) August 11, 2014

#RIP to one of my favorite and best actors ever. So sad, such a great guy and amazing talent. Was in a… http://t.co/PWd7JU2Bva
— Travis Barker (@travisbarker) August 11, 2014

Terrible news about Robin Williams. Thoughts and prayers for his loved ones and friends
— Shannen Doherty (@DohertyShannen) August 11, 2014

O Captain! My Captain! Rise up and hear the bells. Rise up, for you the flag is flung, for you the bugle trills.
— Anna Kendrick (@AnnaKendrick47) August 11, 2014

Can not believe this news. Robin Williams was such an immense talent, comedic & dramatic. We lost a legend today. Just shocked.
— Kevin McHale (@druidDUDE) August 11, 2014

OMG! #RIPRobinWilliams. Gutted by this one… :(
— Ricki Lake (@RickiLake) August 11, 2014

Rest in peace Robin Williams. You've given me laughter for as long as I can remember. Sending prayers to your loved ones.
— Bridgit Mendler (@bridgitmendler) August 11, 2014

Robin Williams feels like we always knew you. And we didn't. What a gift. Thank you for sharing your life ... http://t.co/mzyTuGS8yW
— rose mcgowan (@rosemcgowan) August 11, 2014

Stunned at the news about Robin Williams. So sad when hopelessness overwhelms imagination.
— Brad Bird (@BradBirdA113) August 11, 2014

So unbelievably and deeply saddened to hear this news about Robins Williams. Please someone say this is a hoax.
— Ashley Parker Angel (@ParkerAngel) August 11, 2014

heartbroken by the news of Robin Williams passing. My heart goes out to his friends and family. We lost a legend today.
— Jenna Ushkowitz (@JennaUshkowitz) August 11, 2014

Robin Williams made us all laugh. He was a kind man. I wish him peace and his family comfort.
— Maria Shriver (@mariashriver) August 11, 2014

Thank you for making the world laugh so hard we cried... Over and over and over again.. RIP
— Julie Benz (@juliebenz) August 11, 2014

So profoundly broken hearted that @robinwilliams will never laugh again. How brilliant was he? Beyond description. #beyond sad
— Kathie Lee Gifford (@KathieLGifford) August 11, 2014

RIP Robin Williams. Your work has brought joy and laughter to millions of people. May you find your deserved solace in the next life.
— Jared Padalecki (@jarpad) August 11, 2014

Robin Williams ... You were an idol and an inspiration. As a child I began to dream of making movies because ... http://t.co/0ebeDCFmNG
— Sophia Bush (@SophiaBush) August 11, 2014

Uh uh. No. Don't want this to be true about Robin Williams. Inspired everyone I know. THE Improviser. :(
— Rachel Dratch (@TheRealDratch) August 11, 2014

Mr. Williams visited me the first day of filming The Parent Trap. I will never forget his kindness. What an enormous loss. My condolences.
— Lindsay Lohan (@lindsaylohan) August 11, 2014

Robin Williams, it was an honor to know you. #restinpeace @ The Butler set, New Orleans http://t.co/OEkbhwlRac
— Lenny Kravitz (@LennyKravitz) August 11, 2014

The world is a sadder place tonight. Robin Williams was unique and wonderful.
— R.L. Stine (@RL_Stine) August 11, 2014

Saddened by loss of Robin Williams; praying for his loved ones. Legacies of lightness are sometimes left by people with the heaviest hearts.
— Debby Ryan (@DebbyRyan) August 11, 2014

Honored to have worked w such a bright light and brilliant man. Love and prayers to his family and friends. #RIPRobinWilliams
— Mandy Moore (@TheMandyMoore) August 11, 2014

Robbin Williams name etched throughout my mind made me cry laugh and think you'll be missed
— Michelle Rodriguez (@MRodOfficial) August 11, 2014

God bless Robin Williams. None of us know the darkness that he bravely fought must of his life. #Prayers #RIP
— Dennis Haskins (@mrbelding) August 11, 2014

RIP mr Williams - beyond great talent -such a kind and lovely person
— John Cusack (@johncusack) August 11, 2014

We are heartbroken at the loss of comedy genius #robinwilliams #feelslikelosingfamily pic.twitter.com/aRDUdEh3cI
— HANSON (@hansonmusic) August 11, 2014

Farewell to my childhood hero and my Genie. The world won't be the same without him.
— Scott Weinger (@ScottWeinger) August 11, 2014

Just heard the news on @robinwilliams! What a talented individual so sorry! Once again we have lost an incredible talent! Prayers to family!
— La Toya Jackson (@latoyajackson) August 11, 2014

I love you Robin. We all did/do. No one will ever compare to you. May you rest in peace.
— JoJo (@JoJoistheway) August 11, 2014

Oh Robin...Our hearts are broken. Rest in peace darling. We loved you.
— Goldie Hawn (@goldiehawn) August 11, 2014

We mourn the loss of our friend Robin Williams, who always made us laugh and smile. pic.twitter.com/UOY8LTjVRA
— Sesame Street (@sesamestreet) August 11, 2014

I am so heartbroken. Robin Williams was a light in my childhood. Rest in peace.
— Emmy Rossum (@emmyrossum) August 11, 2014

So so sad to hear about the passing of Robin Williams. He will forever have a joyful place in our hearts and will be missed.
— Candace Cameron Bure (@candacecbure) August 11, 2014

He was Sweet LOVELY,Man. He ran high voltage,Mind Always Going, It was who he was.I Know Well..Many X's from High There is Only Low.So Sad😥
— Cher (@cher) August 11, 2014

#RIP Robin Williams...you will be remembered by many...
— Eva Longoria (@EvaLongoria) August 11, 2014

I'm shocked. This can't be happening! What a huge loss. #robinwilliams
— Wendi McLendon-Covey (@wendimclendonco) August 11, 2014

Oh my. One of my favorites has passed. Robin Williams, you were brilliant. Such a great talent. We have a lost a great one.
— Tamera Mowry-Housley (@TameraMowryTwo) August 11, 2014

Wish Robin could have seen that the world loved him. The fact that people quote from so many different shows, films, stand up says it all.
— edgarwright (@edgarwright) August 11, 2014

#RipRobinWilliams love and prayers to his family and friends.
— bella thorne (@bellathorne) August 11, 2014

Holy shit. We are all so fragile! Love and prayers @robinwilliams family et al. Such a loss. Such a terrible loss.
— Katey Sagal (@KateySagal) August 11, 2014

Robin Williams! Your work! Your heart! Your brain! So much left for you to do. So much more to love you for! Heartbroken. Rest in peace.
— Alyssa Milano (@Alyssa_Milano) August 11, 2014

RIP Robin Williams.. So fucking horrible. I will always cherish so many performances..
— Grant Gustin (@grantgust) August 11, 2014

God bless you @robinwilliams. Thank you for the laughter and insights. #RIPRobinWilliams
— Wes Craven (@wescraven) August 11, 2014

I am heartbroken at the loss of Robin Williams, a man who provided me, my family, and the world with so many happy moments.
— Dr. Mehmet Oz (@DrOz) August 11, 2014

It's the mark of a true artist. I never knew him but I'm heartbroken by his passing. RIP Robin Williams.
— Jesse Tyler Ferguson (@jessetyler) August 11, 2014

7 years old w/ a single mom the first time I saw #MrsDoubtfire. Made me feel better about being from an unconventional family. Love is love.
— Emmy Rossum (@emmyrossum) August 11, 2014

I can’t believe the news about Robin Williams. He gave so much to so many people. I’m heartbroken.
— Ellen DeGeneres (@TheEllenShow) August 11, 2014

I didn’t know I could be so sad, angry, stunned and grateful at the same time. RIP Robin Williams. If you are in pain please seek help.
— Jim Gaffigan (@JimGaffigan) August 11, 2014

I was partially raised by Robin Williams films. I would come home to watch "Mrs. Doubtfire" everyday after school as I found comfort in the
— Harry Shum Jr (@HarryShumJr) August 11, 2014

Rest in peace Robin Williams.
— Eric Stonestreet (@ericstonestreet) August 11, 2014

Robin Williams was the first person ever to make me laugh other than my dad. #Mork
— Jeff Ross (@realjeffreyross) August 11, 2014

My heart aches at the news of your passing... This is how I want to remember the face of an incredible… http://t.co/cSAfkGtMev
— Dania Ramirez (@DaniaJRamirez) August 11, 2014

Robin Williams made the world a little bit better. RIP.
— Steve Carell (@SteveCarell) August 11, 2014

Devastating finding out about @robinwilliams today. He was an amazing talent and incredibly sweet. So sad.
— Kelly Clarkson (@kelly_clarkson) August 11, 2014

Absolutely stunned and heartbroken. I dont know what to say. He was a huge part of my childhood. #RIPRobinWillams
— Evan Rachel Wood (@evanrachelwood) August 11, 2014

Wow...really sad news about #robinwilliams An incredible talent that will be missed.
— Kris Allen (@KrisAllen) August 11, 2014

So sad so very sad about Robin. My head and heart extend to his family.
— Tim Allen (@ofctimallen) August 11, 2014

Grew up watching the great #robinwilliams thank you for laughs, the inspiration…The world lost a legend….#RIP
— Shanna Moakler (@ShannaMoakler) August 11, 2014

@robinwilliams was a kind and brilliant man. A great light has gone out.
— Casey Affleck (@CaseyAffleck) August 11, 2014

So sad to hear about Robin Williams. I really liked him. Such a great talent gone too soon. #RIPRobinWilliams
— Lil' Kim (@LilKim) August 11, 2014

No words can express the sadness I feel for this tragic loss. My prayers are with the Williams family. RIP Robin Williams. -ZS
— Zoe Saldana (@zoesaldana) August 11, 2014

A massive loss to all of us, the power of a true artist is being felt today, a fully deserved rest in peace to the great Robin Williams
— Taylor Momsen (@taylormomsen) August 11, 2014

So sad to hear about Robin Williams. Thank you for sharing your gift with the world and bringing so much joy to so many people. RIP
— Chord Overstreet (@chordoverstreet) August 11, 2014

Awful news. Awful. Thank you RW.
— Chris Mintz-Plasse (@MintzPlasse) August 11, 2014

The world has lost a comic genius & huge talent. Interviewing Robin Williams was like taking the wildest roller coaster ride of your life.
— Katie Couric (@katiecouric) August 11, 2014

RIP Robin Williams one of the rarest and most remarkable talents we'll ever come across :( you will be missed but never forgotten
— Dylan O'Brien (@dylanobrien) August 11, 2014

Thank you Robin Williams for sharing your enormous talent with us for all of these years. You'll be missed.
— Adrianne Palicki (@AdriannePalicki) August 12, 2014

pic.twitter.com/4Pyx4Kfuxe
— Sarah Michelle (@RealSMG) August 12, 2014

I am heartbroken. Dear, sweet friend, Robin Williams, gone. Our prayers for peace to all his friends and family, his beautiful children.
— Rita Wilson (@RitaWilson) August 12, 2014

We've lost our funniest father. RIP Robin Williams.
— Pedro Pascal (@PedroPascal1) August 12, 2014

RIP ROBIN WILLIAMS http://t.co/3Gfa2WFccl
— Diddy (@iamdiddy) August 12, 2014

The world lost one of the great's today. So sad... RIP @robinwilliams :(. pic.twitter.com/GA9gfsFivh
— Elvira (@TheRealElvira) August 12, 2014

Robin Williams was my hero growing up. You know someone is special when the whole world considers them family.
— Chris Colfer (@chriscolfer) August 12, 2014

I can't deal with this sad loss heartbroken!! Brilliant actor,role model and amazing human being we will miss you so much #RobinWilliams 😭
— Eiza Gonzalez Reyna (@eizamusica) August 12, 2014

Deeply saddened by the news. #RIPRobinWilliams. Thank you for bringing laughter and light for so many years. You will never be forgotten.
— backstreetboys (@backstreetboys) August 12, 2014

That kind of goodness of spirit doesnt ever die. You can all on its embrace at any moment. #RobinWilliams http://t.co/XOOsmKOyZ8
— Juliette Lewis (@JulietteLewis) August 12, 2014

So sad to hear about Robin Williams! Today the world lost one of its brightest and funniest #RIP
— Carmen Electra (@carmenelectra) August 12, 2014

Not real. RIP mad genius. Inspiration. Legend.
— christina applegate (@1capplegate) August 12, 2014

"No matter what people tell you, words and ideas can change the world." -Robin Williams... http://t.co/nfI2PPBNBQ
— Vanessa Hudgens (@VanessaHudgens) August 12, 2014

"o captain! my captain! rise up and hear the bells. rise up - for you the flag is flung - for you the… http://t.co/XMC8YlHTZe
— Zachary Quinto (@ZacharyQuinto) August 12, 2014

Just shared a moment of silence on the set for Robin Williams, a man who brought so much laughter, joy and healing to so many.
— Lena Dunham (@lenadunham) August 12, 2014

RIP @robinwilliams. Forgetting this incredible man is an impossibility. Tragic news.
— Sam Claflin (@samclaflin) August 12, 2014

From a whole generation; Thank you. Especially for this.. 💔 pic.twitter.com/iUEwIdtEHE
— Ellen DeGenres (@TheElIIenShow) August 11, 2014

A huge loss to this generation and more importantly his loved ones... My condolences . Rest in peace to you RW. #robinwilliams #comicgenius
— Jeremy Renner (@Renner4Real) August 12, 2014

#Heartbroken to hear you're no longer with us #RobinWilliams - and that your final hours weren't marked with the love we all feel for you.
— AnnaLynne McCord (@IAMannalynnemcc) August 12, 2014

RIP, great soul. We hope your spirit has found peace. pic.twitter.com/xuFDO2qhXp
— George Takei (@GeorgeTakei) August 12, 2014

We lost a great light. Rest peacefully Robin Williams.
— Naya Rivera Dorsey (@NayaRivera) August 12, 2014

Robin Williams... Thank u for making me laugh for so many years. Very sad to lose you. RIP. 😞
— Peter Facinelli (@peterfacinelli) August 12, 2014

How very sad. I just heard about Robin Williams. My heart goes out to his family.
— lisa rinna (@lisarinna) August 12, 2014

Deeply saddened by the passing of one of the greatest artists of our time Thank you for bringing us joy all the years. R.I.P. #RobinWilliams
— LeAnn Rimes Cibrian (@leannrimes) August 12, 2014

He was one of my favorite people. #RobinWilliams pic.twitter.com/APxbRxrYGw
— Cheryl Hines (@CherylHines) August 12, 2014

The first thing I ever wanted to be when I grew up was Robin Williams’ inhabiting of Popeye. #RIPRobinWilliams
— John Mayer (@JohnMayer) August 12, 2014

Grew up watching this comic genius. Such a tragedy. Thoughts to his family & loved ones. #RIPRobinWilliams
— Ming-Na Wen (@MingNa) August 12, 2014

I am named after a character from a Robin Williams TV show when my parents still lived in Africa. He meant so much, to so many, so far away.
— Mindy Kaling (@mindykaling) August 12, 2014

Truly heartbreaking news #RIPRobinWilliams
— Emily VanCamp (@EmilyVanCamp) August 12, 2014

I'm so saddened about #RobinWilliams passing. Just started to show the twins his movies - he made us all smile. Prayers for him & his family
— Nancy Grace (@NancyGraceHLN) August 12, 2014

When I was 18 I got a job as an intern at Comic Relief just to be near him. A genius and a truly kind man who made the world a better place.
— Judd Apatow (@JuddApatow) August 12, 2014

Rest in peace Robin Williams... The few times I spoke with him he was incredibly kind. You will be missed.
— Dylan McDermott (@DylanMcDermott) August 12, 2014

So unbelievably sad to hear about Robin Williams passing. He gave so much to the world. I hope he's in peace now. RIP
— oliviamunn (@oliviamunn) August 12, 2014

Robin Williams was my idol, my inspiration, my path to acting. "all right, sparky" what a bright light. He shined on me and lit me up.
— Vanessa Lengies (@littlelengies) August 12, 2014

WOW. Just heard about Robin Williams. So, so sad. If you’re hurting, please, PLEASE get help.
— Jeri Ryan (@JeriLRyan) August 12, 2014

So very sad. #RIPRobinWilliams
— alyson hannigan (@alydenisof) August 12, 2014

Absolutely stunned to hear the news about Robin Williams. It's unimaginable to me that we've lost such a genuinely funny and sweet man.
— Conan O'Brien (@ConanOBrien) August 12, 2014

Processing the loss of such a treasure. Lamenting that he felt so alone when so many cherished him. #RIPRobinWilliams
— Holly Robinson Peete (@hollyrpeete) August 12, 2014

oh my god… i just found out my dear, old friend, robin williams has past away. this is horrible news. rest... http://t.co/dF61y1ir5R
— Dante Basco (@dantebasco) August 11, 2014

Oh captain, my captain.
— Uzo Aduba (@UzoAduba) August 12, 2014

I was one of the many lucky people who got to act with Robin, and he was as sweet as can be imagined. Grateful for the time with him :)
— dax shepard (@daxshepard1) August 12, 2014

A tweet cannot begin to describe the hugeness of Robin Williams heart and soul and talent. This is so sad. #RobinWilliams
— Ben Stiller (@RedHourBen) August 12, 2014

🙏RIP🙏 Robin Williams. Thank you for everything you have to us. You will always be loved. 👼 http://t.co/GqPnyOecN2
— Mena Suvari (@mena13suvari) August 12, 2014

Robin Williams in dead poets society was so influential on me. Rest in peace <3
— Pete Wentz (@petewentz) August 12, 2014

Watching him with Christopher Reeve made me love him even more for his compassion than only just his comedic brilliance. #RIPRobinWilliams
— Molly Ringwald (@MollyRingwald) August 12, 2014

RIP sweetie .... you made the world laugh for decades... Rest a while xxxooo
— Kirstie Alley (@kirstiealley) August 12, 2014

RIP Robin Williams What a tragic loss. I have no words to describe how sad my family and I feel. Our thoughts and prays are with his family
— Joey Lawrence (@joeylawrence) August 12, 2014

#RIPRobinWilliams so heartbreaking.... thank u for the joy & laughter.... condolences, love and light to his family during this tragic time
— Ariana Grande (@ArianaGrande) August 11, 2014

Magnificent Robin RIP. The Black Dog won the war. So sad. Thank you for the quarter you loaned me to call my mom at the '90 Globes.
— Kathy Bates (@MsKathyBates) August 12, 2014

I am so sad to hear about Robin Williams. I only knew him and his family a little, but I know he was well loved and will be missed. RIP.
— Sheryl Crow (@SherylCrow) August 12, 2014