Guest Stars Zuzanna Szadkowski as Dorota Kishlovsky Sebastian Stan as Carter Baizen Aaron Tveit as Trip van der Bilt Holley Fain as Maureen van der Bilt James Naughton as William van der Bilt Jill Flint as Bex Co Starring Karen Culp as Upper Crust #2 Robert Emmet Lunney as Dean Wheeler Emily Fletcher as Society Matron Marlene O'Haire as Upper Crust #1 Uncredited Kristen Bell voices Gossip Girl