Mischa Barton has split from her boyfriend Sebastian Knapp after more than a year together, according to U.S. reports. The O.C. star and the British actor parted ways over a month ago due to their hectic work schedules, but a source close to the former couple tells Perezhilton.com that their were no hard feelings. The insider says, "It was amicable. She is concentrating on her new projects and is in production on a new film." The split comes just months after Barton's representative denied engagement rumours after the actress was spotted wearing a gold ring on her left hand.