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To forestall her mother’s likely intervention, Blair is even more determined to remedy Waldorf Designs' problems by making a splash with a dress at the upcoming Cotillion – but a shocking revelation at the ball affects everyone.

Serena becomes worried about Steven's attitude toward her, though some investigating reveals the surprising reason why.

Chuck finds an unlikely ally as he tries to drive a wedge between Bart and Lily's relationship to help expose his father's secret.