Happy Birthday, Adam Brody!

The actor celebrates his 34th birthday today -- and he's definitely come a long way from his days on "The O.C." as lovable nerd Seth Cohen!

Since finding fame on the popular Fox series, Brody has gone on to star in a series of hit movies, including "Jennifer's Body," "Mr. and Mrs. Smith" and "Lovelace." He’s also had success on the small screen, starring in "Good Vibes," "Burning Love" and the Showtime hit, "House of Lies." 

Not only has Adam managed to charm fans with his adorable smile, he’s also found lasting love with "Gossip Girl" starlet Leighton Meester. The cute couple got engaged last month, after less than a year of dating. He previously dated on-and-off-screen love Rachel Bilson for three years.

Adam and Leighton were friends for years, getting close in 2011 while co-starring in the film, "The Oranges." They took their relationship to the next level in January. The adorable duo are rumored to be tying the knot next summer.

It’s a true CW love story! 

It’s hard to believe that it’s been ten years since Brody made his debut on “The O.C.” Click “Launch Gallery” above to see Adam and his "O.C." co-stars, then and now!

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