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Leighton Meester and Adam Brody Engaged!

The Cinema Society with The Hollywood Reporter & Samsung Galaxy S III host a screening of "The Oranges" After Party

Credit: Andrew H. Walker/Getty Images

Leighton Meester and Adam Brody are engaged!

The cutie pie couple of 10 months is heading to the altar after the former Gossip Girl star accepted Adam’s surprise proposal.

“Leighton and Adam are crazy about each other and have talked about getting married eventually,” an insider tells Star. “But she had no idea he would propose so soon! It was the surprise of her life and she’s ecstatic!”

Adam, 33, and Leighton, 27, have been friends for years, getting close in 2011 while co-starring in the independent film, The Oranges. In January they took their relationship to the next level and were soon spotted taking in art exhibits at the Los Angeles County Museum of Art and traveling together through Bangkok in February.

Adam previously dated director Lorene Scafaria in 2010 and his co-star on The O.C., Rachel Bilson, for three years. Leighton was most recently linked to actor Aaron Himelstein, which followed her 2-year relationship with Gossip Girl co-star Sebastian Stan ending in 2010.

“Right now their plan is to get married next summer,” adds the insider. “They are still deciding if they want a destination wedding or if they’ll marry in Southern California somewhere.”

While there are no plans for children in the immediate future the couple do have two dogs together, Penny Lane and Trudy.