From Paris to New York, we've been tracking the fabulous on-set fashion as Blake Lively, Leighton Meester and the rest of the Gossip Girl gang film Season 4—and now we've got a sneak peek at the plot! According to the trailer above, the drama ensues: Serena falls in love with a French waiter? Dan Humphrey is a father? And what about Clemence Poesy, Chuck's supposed new love interest? (The montage suggests Poesy is out as Blair and Chuck resolve unfinished business.) Will you tune into Season 4, premiering September 13th? Tell us in the comment section below!