DAN’S BOOK IS SHOWCASED BY UPRIGHT CITIZEN’S BRIGADE – Dan feels honored when he learns that Upright Citizen’s Brigade is performing excerpts from his book, Inside. Blair tries to prove Serena’s suspicions wrong in order to save their friendship. On her way out of town, Ivy ends up on a collision course with the van der Woodsens. Chace Crawford, Ed Westwick, Kelly Rutherford and Matthew Settle also star. John Terlesky directed the episode written by Amy B. Harris.