Leighton Meester is spotted being hounded by the paparazzi on the set of Gossip Girl in New York last week (October). They aren't "real" paparazzi - it was all part of the scene.
In an interview with this month's Nylon magazine, Leighton's co-star Penn Badgley had some kind thing to say about her:
"I'll tell you that I've never enjoyed any scenes on the show as much as those scenes with Leighton Meester, on a strictly intellectually as an actor. There's a whole other thing—like everything that happened early on in the show, like the obvious Dan and Serena [Blake Lively] stuff, that moved me in a different way for obvious reasons, but strictly as an actor, those scenes with Blair are the best."