The new episode of Gossip Girl (The Ex-Files) airs Tonight - Monday @ 8/9 c on The CW.
The clip below is of Nate (Chace Crawford) trying to find out what's up with Vanessa (Jessica Szohr) after the party. Vanessa will discover a scandalous secret about Catherine (guest star Madchen Amick) and enlists Blair’s scheming expertise to use the information to help Nate.