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Kelly Clarkson! Adele! Katy Perry! See who got busy celebrating way into the night
Credit: Kevin Mazur/WireImage
Updated: Monday Feb 11, 2013 | 10:00 AM EST
By: Kiran Hefa & Kate Hogan
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Click to view your favorites as they make their way down the red carpet
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Toasting his return to the music scene, Pete Wentz enjoys some catch-up time with Rihanna, (who changed dresses) at the Island Def Jam party at Los Angeles eatery Osteria Mozza.
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