Guest Stars Margaret Colin as Eleanor Waldorf Wallace Shawn as Cyrus Rose Aaron Tveit as Trip van der Bilt Holley Fain as Maureen van der Bilt Tamara Feldman as Poppy Lifton James Naughton as William van der Bilt Armie Hammer as Gabriel Edwards Will Rogers as Wes Co Starring Sarah Wilson as Corinne Sofia Sokolov as Anna Tom Titone as Allan Levy Marilyn Bernard as Ida Francesca Di Mauro as Seamstress Uncredited Kristen Bell voices Gossip Girl