We've posted three promos for you already, now here's a sneak preview clip from next Monday's all-new Gossip Girl, "Double Identity," in which Blair and Serena chat about B's upcoming date with Louis and S' difficult choice between Nate and Dan.

As they leave the cafe, Blair says there's nothing that could ruin her date. But we have a hunch a chance run-in with a certain person might change that outlook ...

[video url="http://www.tvfanatic.com/videos/double-identity-sneak-preview-1/" title="Double Identity Sneak Preview #1"] [/video]

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.