This week, Lindsay Lohan runs into Robert DiNero ... in an elevator, Emmy Rossum shows off her beach bod while on vacation and Rihanna celebrates her 26th birthday in the snow!

Also, Kaley Cuoco gets some sweet kisses from the other man in her life, Kim Kardashian hangs out with Joan Rivers and Lady Gaga, and Jessica Simson sends a sweet message to her dad. 

Plus, Miranda Kerr shows off her new undergarments, Carey Hart posts a selfie from the hospital and Heidi Klum travels in her very own private jet! 

Click "Launch Gallery" above to see these stars' personal pics and even more celeb candids in this week's best celebrity TwitPics!

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