Someone Alert Gossip Girl! Leighton Meetster And Adam Brody 'Engaged After Just 10 Months Dating'

The actors star in The Oranges together...

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Leighton Meester and Adam Brody are reportedly engaged after just ten months of dating following their meeting on the set of The Oranges movie.

The former O.C. actor is believed to have popped the question to his ex-Gossip Girl star actress partner and she is thrilled.

The pair had purportedly discussed tying the knot in the future so she was shocked to find him down on one knee so fast.

“Leighton and Adam are crazy about each other and have talked about getting married eventually,” an insider told America’s Star magazine.

“But she had no idea he would propose so soon! It was the surprise of her life and she’s ecstatic!”

Leighton Meester and Adam Brody are engaged according to reports (WENN)

Adam, 33, and Leighton, 27, filmed their flick in 2011 then this January their platonic relationship turned romantic.

They were seen checking out art at the Los Angeles County Museum of Art and on a holiday to Bangkok, Thailand in February.

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

Adam dated director Lorene Scafaria in 2010 and more famously his The O.C. co-star Rachel Bilson for three years.

Leighton was with actor Aaron Himelstein after her two-year relationship with Gossip Girl co-star Sebastian Stan ended in 2010.