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In a fashionable farewell to remember, our favorite Upper East Siders join forces for one last soiree, and the shocking identity of Gossip Girl is finally revealed.

Connor Paolo, Desmond Harrington, Margaret Colin, Michelle Trachtenberg, Sofia Black-D'Elia, Wallace Shawn, William Baldwin, Zuzanna Szadkowski, Chris Hoch, Eli James, Ellie Pettit, Frank Fortunato, Lisa Loeb, Michael Bloomberg, Michaela Annette, Royce Johnson, Stanley Wayne Mathis