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Episode: MEMOIRS OF AN INVISIBLE DAN: After much deliberation, Dan decides to gather Serena, Blair, Nate, Chuck, Rufus and Lily to reveal the truth about his book in the hope that they will support him at his book party. Meanwhile, Blair and Louis (guest star Hugo Becker) hit a crises point after Louis reads Dan's book. Diana (Hurley) learns incriminating information about one of Nate's friends and uses it to her advantage. Kaylee DeFer also stars. Tate Donovan directed the episode written by Amy B. Harris.