This week, Rihanna shows off her beach body (again) and her brand new grill, Chrissy Teigen does her best impression of "Parks and Recreation's" Nick Offerman and Ian Somerhalder looks like he partied way too hard over the weekend!

Julianne Hough hangs with Lindsay Lohan's ex-girlfriend Samantha Rosen, Jamie Lynn Spears shares an adorable snap with her daughter Maddie and Nicki Minaj is caught in the same outfit ... as Tyga

Also, Tony Hawk introduces her super cute (and slightly scared) daughter to a Muppet, Charlie Sheen hangs with his two favorite gals and Mariah Carey has a matching cast with Jane Fonda!

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

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