I do not own. Chuck (Ed Westwick) hosts a "Saints and Sinners" masquerade party at the Empire Hotel. At the party, Dan (Penn Badgley) and Nate (Chace Crawford) don't know what to make of Serena's (Blake Lively) strange behavior and mixed messages. Blair (Leighton Meester) sets her sights on becoming the new face of Anne Archibald's (guest star Francie Swift) foundation for girls, but Anne is concerned that Blair's friendship with Chuck Bass may be problematic. Katie Cassidy guest stars as Juliet. Taylor Momsen, Jessica Szohr, Kelly Rutherford and Matthew Settle also star. Ron Fortunato directed the episode written by Sara Goodman.