Biography: Barton was born in London, England, to an English father and an Irish mother, but moved to New York City when she was four years old. She has two sisters, Hania and Zoe. Barton graduated from the Professional Children's School in Manhattan in 2004.

Barton began her acting career at the age of nine in New York Theatre with a lead role in Slavs!, written by Tony Kushner. She took part in many plays, taking a lead role in James Lapine's Twelve Dreams. She made her film debut in Lawn Dogs, which won awards at film festivals around the world. Since then she has appeared in several films, including The Sixth Sense, Notting Hill, and Lost and Delirious, in which she starred.
Sources: The O.C.