If you thought Jennifer Lopez's Oscar dress was sexy, check out the revealing number she changed into for the Vanity Fair after party at the Sunset Towers hotel.

The sparkling sequined dress featured a plunging front AND back, showing off J.Lo's substantial curves. Inside, she partied with her new boyfriend, Casper Smart.

Jennifer's not the only one who changed after the Academy Awards. Cameron Diaz slipped into a bright orange dress that was impossible to miss.

Sexy couples also turned heads on the red carpet, including David and Victoria Beckham, Tom Cruise and Katie Holmes, and Jason Statham and Rosie Huntington Whiteley.

The party also marked Gerard Butler's first major appearance since finishing rehab. Check out all the hot pics, above!

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