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Chuck hosts a masquerade party at the Empire Hotel. Dan and Nate don't know what to make of Serena's strange behavior and mixed messages. Blair sets her sights on becoming the new face of Anne Archibald's foundation for girls.

Connor Paolo, Deanna Russo, Francie Swift, Jayne Atkinson, Katie Cassidy, Luke Kleintank, Zuzanna Szadkowski, Sebastian LaCause