Mischa Anne Barton is an English-Irish film, television, and stage actress, and occasional fashion model with British, Irish, and American citizenship. She began her acting career on the stage, appearing in Tony Kushner's Slavs! and took the lead in James Lapine's Twelve Dreams at New York's Lincoln Center. She made her screen debut, making a guest appearance on the American soap opera All My Children. She then voiced a character on the Nickelodeon cartoon series KaBlam!. Her first major film role was as the protagonist of Lawn Dogs, an acclaimed drama co-starring Sam Rockwell. She continued acting, appearing in major box office pictures such as the romantic comedy, Notting Hill and M. Night Shyamalan's psychological thriller, The Sixth Sense. She also starred in the critically acclaimed indie crime drama Pups.
She later appeared in the independent drama, Lost and Delirious and played Evan Rachel Wood's girlfriend during a guest-arc on ABC's Once and Again. She is best known for her role as Marissa Cooper in the Fox television series The O.C., for which she received two Teen Choice Awards and a Prism Award nomination.