What’s that Gossip Girl fans? All you want for Christmas is a super-sized final episode? Done! TVLine has learned exclusively that The CW is planning to send Serena, Blair & Co. off with a two-hour series finale event on Monday, Dec. 17. The night will kick off with a look back at the show’s six-year run (featuring clips and interviews with the cast and producers), followed immediately by the final episode. In addition, viewers will be treated to an exclusive sneak peek at the CW’s upcoming Sex and the City prequel, The Carrie Diaries.