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Jennifer Lopez left younger beau Casper Smart at home for the Oscars red carpet, but the sexy 42-year-old Latina brought the backup dancer to the Vanity Fair party.

We have a feeling Casper, 24, is responsible for that spring in JLo's step. Without a doubt, Ms. Lopez's Zuhair Murad gown is to die for!

See more of the sexy fashions at the Vanity Fair Oscars bash in the gallery below.