SERENA POSES AS BLAIR AT AN IMPORTANT MEETING — Blair (Leighton Meester) enlists Serena (Blake Lively) 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. Andy Wolk directed the episode written by Matt Whitney (#523).
