Ed Westwick and his Gossip Girl costar Jessica Szohr have gotten hitched, Usmagazine.com has learned.

The two tied the knot at 7 a.m. Tuesday in Las Vegas, a source tells Us exclusively.

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Westwick, 22, and Szohr, 24, met on the set of their hit CW show. They were first spotted smooching at a Dallas airport last November after spending Thanksgiving with Chace Crawford and his family.

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Despite PDA-packed trips to Miami and Los Angeles, they rarely publicly acknowledge their relationship.

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She did, however, credit Westwick with one thing: Introducing her to burgers. After 10 years of eating vegetarian, I tried my boyfriend's," she told the June issue of Women's Health. "I was overwhelmed. It was orgasmic."