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

Cast: Blake Lively, Leighton Meester, Penn Badgley, Chace Crawford, Ed Westwick, Kaylee DeFer, Kelly Rutherford, Matthew Settle, William Baldwin, Sofia Black-D'Elia, Margaret Colin, Desmond Harrington, Connor Paolo, Wallace Shawn, Zuzanna Szadkowski