Billy Baldwin just wrapped up a recurring role on Parenthood. Now he's returning to Gossip Girl as William van der Woodsen, to whom we were introduced last spring.

The father to Serena (Blake Lively) and Eric (Connor Paolo) and the ex-husband of Lily (Kelly Rutherford) is slated to appear in at least two episodes of the CW drama.

What do you think brings William back this season? It will be very interesting to see how that's handled, given how he left things in Season Three. Any predictions?

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