In Gossip Girl casting news, Wallace Shawn (the source of many funny Clueless and The Princess Bride quotes) is joining the show for a multi-episode arc.

The actor will reportedly play Cyrus, the father of Serena van der Woodsen's new boyfriend Aaron Rose (to be played by John Patrick Amedori).

If the series follows the Gossip Girl books, Cyrus will eventually marry the  mother of Blair Waldorf, Eleanor. Could be interesting ...

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