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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READY TO RUMBLE

With their girlfriends Kate Middleton and Chelsy Davy (not pictured) watching from the stands, Princes William and Harry take the field for the Audi Polo Match at Coworth Park, Berkshire, on Sunday.