SERENA (Blake Lively) POSES AS BLAIR (Leighton Meester) AT AN IMPORTANT MEETING—Blair enlists Serena to be her stand-in at an important meeting when Blair finds herself needing to be in two places at the same time. Meanwhile, Ivy (Kaylee DeFer) and Lola (guest star Ella Rae Peck) team up to help Chuck (Ed Westwick) with a personal vendetta, and Nate (Chace Crawford) makes a decision about the future with Diana Payne (guest star Elizabeth Hurley). Penn Badgley also stars.
Gossip Girl airs every Thursday at 8 p.m. on ETC.