Leighton Meester and Adam Brody are engaged, multiple sources have confirmed.

The couple has been dating for less than a year and will be working together in the upcoming film Life Partners

A source told Us Weekly they were "always close and friendly" and worked together on the 2011 film The Oranges.

Meester most recently dated Aaron Himelstein and Brody called it quits with director and screenwriter Lorene Scafaria in 2010. He also dated his O.C. co-star Rachel Bilson for three years.

An insider also told Star magazine of Meester, 27, and Brody, 33, “are crazy about each other and have talked about getting married eventually. But she had no idea he would propose so soon! It was the surprise of her life and she’s ecstatic!”

Meester and Brody’s breakout television show - Gossip Girl and The O.C., respectively – were both created by Josh Schwartz.

Insiders also say the couple, who share two dogs together, are eying summer wedding date.

“They are still deciding if they want a destination wedding or if they’ll marry in Southern California somewhere,” said the source.

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