The search for Serena's father is officially over.
After being MIA for nearly three seasons, 'Gossip Girl''s William van der Woodsen (played by William Baldwin) makes a surprise visit on the Upper East Side tonight, where he's reunited with Serena, Eric and -- wait for it -- Lily's current husband, Rufus.
How does his long-awaited reunion with Serena go? What trouble might he have in store for Rufus? And what happens when Eric comes out of the closet?
In an exclusive interview, Baldwin spoke to TV Squad to give us the rundown on his three-episode arc, which begins tonight at 9PM ET on the CW.
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