It's off between Barton, Knapp

US - They have previously denied having engagement plans, but now we know it's never happening for Mischa Barton and ex-boyfriend Sebastian Knapp.

The British-American actress and British actor, who dated for a year, apparently broke up a few months ago.

A source told E! News: "It was amicable. She is concentrating on her new projects and is in production on a new film."

Barton, 27, has been busy filming thriller Beyond Justice and will be shooting horror film Zombie Killers: Elephant's Graveyard next month.

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