August 16, 2010 at 11:41 AM EDT

An unlikely winner has emerged in Gossip Girl‘s heated Dan/Serena/Nate triangle: Sam Page!

A Gossip rep confirms that the Desperate Housewives/Mad Men hottie is joining the cast for a multi-episode arc as Serena’s (Blake Lively) new love interest.

Page’s first episode is expected to fall in October. Gossip Girl‘s fourth season kicks off on Sept. 13.

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