Leighton Meester joined Chace Crawford, Blake Lively and Ed Westwick yesterday on the NYC set of Gossip Girl. Unlike her edgier performance look at Tuesday's American Eagle party, Leighton kept things prim and proper as she got into character as Blair Waldorf. You guys aren't quite sure what to make of Leighton's tendencies to strip down when she goes into musical mode, but she's not the only Upper East Sider who likes to show a bit of skin.
For more photos from the Gossip Girl set just
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