The American Eagle Flagship Store preview party was packed with young Hollywood celebs last night. Leighton Meester performed at the event in NYC to celebrate the grand opening of the American Eagle Outfitters 25,000-square-foot shopping destination in Times Square. Fellow Gossip Girl co-stars Jessica Szohr and Michelle Trachtenberg were in attendance along with Adrian Grenier, Ashlee Simpson, Pete Wentz and others.

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