Diana's big secret is finally revealed on this week's Gossip Girl, and Chuck has to deal with more parental problems than he'd ever imagined. Blair returns to her scheming roots, which leads Dan to question their relationship, and Serena plots to take over the Gossip Girl role once and for all. Blackmail, threats, and cryptic codes take over the Upper East Side — and Chuck is forced to face his past in a major way. From writer's block to brothels, let's recap this week's top OMG moments.
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