On the Set of Gossip Girl

See Chace Crawford, Taylor Momsen, Blake Lively and other stars behind the scenes of their hit show

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STEP SISTERS

Ready for their scene, Blake Lively and Leighton Meester – better known as frenemies Serena van der Woodsen and Blair Waldorf – hang out on the steps of New York's Metropolitan Museum of Art, where the Upper East Side prep schoolers hang out, show off their expensive fashions and – what else? – gossip.