G-Girl, Season 5 - Episode 16: Cross Rhodes

Dan (Penn Badgley) feels honored when he learns that Upright Citizen’s Brigade is performing excerpts from his book, Inside. Blair (Leighton Meester) tries to prove Serena’s (Blake Lively) suspicions wrong in order to save their friendship. On her way out of town, Ivy (Kaylee DeFer) ends up on a collision course with the van der Woodsens.

(Source: TV Fanatic)