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Blair is caught off-guard by a surprise guest at her birthday party. Having had enough of Chuck and Blair’s games, Serena and Nate decide to plan an intervention.

Alice Callahan, Amanda Setton, Connor Paolo, David Call, Jayne Atkinson, Katie Cassidy, Margaret Colin, Sam Page, Zuzanna Szadkowski, Cynthia Rowley, Joe Zee, Rachel Zoe, Robyn, Savannah Wise