Mischa Barton & Sebastian Knapp BROKE UP!! Get Super Sad Split Deets HERE!

O.C. Oh no!

Mischa Barton and Sebastian Knapp broke up!!!

Those two lovely lovebirds dated for over a year and were constantly rumored to be considering an engagement, but they couldn’t make it twerk work!

Someone close to the couple says the two have actually been donezo for over a month now, which totally explains the recent sad looks!

The source continues:

“It was amicable. She is concentrating on her new projects and is in production on a new film.”

We’re happy you’re focusing on your career, gurl! It’s been ten years since you wowed us in The O.C. and the world is primed for your comeback!

One of Mischa’s upcoming features is called Zombie Killers: Elephant’s Graveyard!! Well, OK! We hope that’s box office gold!

[Image via WENN.]