Watch! Leighton Meester Performs "The Stand In" at Tiffany & Co. in NYC, September 8, 2011

Leighton Meester (Blair) continues to do her music thing and it (finally) looks like she's found her sound. On Thursday, September 8, the Gossip Girl performed with her now regular collaborators, band Check in the Dark, at Tiffany & Co. for  Fashion's Night Out in New York.


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