Gyllenhaal shows off her glamorous side at the London premiere of The Dark Knight. Plus: Nicole & Keith, Chace Crawford, Tom & Katie and more

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BIRTHDAY BOY

Chace Crawford has a prime seat as he hosts the Mercedes-Benz Polo Challenge Saturday at the Bridgehampton Polo Club in Bridgehampton, N.Y. Later that night, the Gossip Girl star, who turned 23 on Friday, celebrated his birthday with a white-chocolate cake and 200 cupcakes at a barbecue attended by costars Penn Badgley and Blake Lively.