After Blair's mother, Eleanor (recurring guest star MARGARET COLIN), gives Blair an ultimatum, 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 ballaffects everyone. Serena becomes worried about Steven's (recurring guest star BARRY WATSON) attitude toward her, but after some investigating she discovers the surprising reason why. Chuck finds an unlikely ally as he tries to drive a wedge between Bart (recurring guest star ROBERT JOHN BURKE) and Lily's relationship to help expose his father's secret. Meanwhile, Dan publishes another article, but the effect is just the opposite of what he was hoping for.
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