From one slinky plus-one to major costume drama, see how Demi Lovato, Katy Perry and more upped the fun factor
Credit: Jeff Kravitz/FilmMagic
Updated: Sunday Aug 28, 2011 | 10:00 PM EDT
By: Kiran Hefa
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From Selena's lace corset to Katy's leopard-print dress, the stars didn't hold back
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