The Gossip Girl costars hit the Nina Ricci party following the Met's Costume Institute gala in New York. Plus: Katie Holmes, Paula Abdul, Paris & Benji and more

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PEP IN HER STEP

A cheerful Naomi Campbell stands out in a crowd in New York City on Monday. The supermodel will be on the small screen when she guest stars on Ugly Betty's season finale. And there was no diva behavior from Campbell on the set: "She is so willing to make fun of herself," Betty star Michael Urie tells PEOPLE.