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It looks like Blair Waldorf has a new boyfriend!
The 26-year-old actress co-starred with Brody, 33, in the 2011 romantic comedy "The Oranges."
"They were always close and friendly" while on set, an insider told Us Weekly.
While the couple has been keeping their relationship largely under wraps, they traveled to Bangkok together earlier this year and have been spotted checking out art exhibits in the Los Angeles area.
Brody has appeared in Mr. & Mrs. Smith and Thank You For Smoking, although he is best known for his stint as the adorable nerd Seth Cohen. He previously dated his The O.C. co-star Rachel Bilson - who played his character's onscreen love interest.
Meester has also been linked to several co-stars including Sebastian Stan (Gossip Girl's Carter Baizen) and Aaron Himelstein (Remember the Daze).