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In 1996, she returned to the show, replacing Michelle Trachtenberg in the role of Lily Benton Montgomery.
Barton won critical favour for her role, with Janet Maslin of The New York Times praising her "poised" performance Barton then appeared in Notting Hill (1999) and The Sixth Sense (1999).
Barton has since appeared in the comedy remake St Trinian's (2007), the Richard Attenborough–directed drama Closing the Ring (2007) and Assassination of a High School President (2008).
She returned to television, starring in the short-lived Ashton Kutcher-produced CW series The Beautiful Life: TBL (2009).
She also holds Irish citizenship, being an Irish citizen automatically by virtue of her mother being Irish.
Barton graduated from the Professional Children's School in Manhattan in 2004, and took a summer short course called Acting Shakespeare at The Royal Academy of Dramatic Art in London, in June and July 2006, Barton began acting at the age of eight, co-starring in the Off-Broadway premiere of the 1994 play, Slavs! Vincent Canby of The New York Times praised Barton's "so fine" and "chillingly authoritative" performance.