Haylie Duff's early career started by making guest appearances on made-for-television movies such as "Hope" and "True Women," and on TV shows such as "The Amanda Show," "Chicago Hope," "Boston Public" and "Third Watch." Duff became a familiar face starting in late 2002 as Cousin Amy Sanders on the Disney Channel series "Lizzie McGuire" starring her sister, Hilary Duff.
In 2004, Duff made a guest appearance on "That's So Raven" as Katina Jones. Duff then received her first role in a feature film when she was cast as Summer Wheatley in "Napoleon Dynamite." The film earned her a Teen Choice Award. She continued her career making guest appearances on "Joan of Arcadia" and "American Dreams." She also lent her voice talent to the animated Christmas film "In Search Of Santa," which was targeted at kids and also featured her sister Hilary. In 2005, Duff joined the cast of the TV show "7th Heaven," playing Sandy Jameson, and has also starred in the feature film "Material Girls" with her sister.
Duff has appeared in various made-for-television or straight-to-DVD movies including "Nightmare," "My Sexiest Year," "Legacy," "Backwoods" with Ryan Merriman, the Hallmark Channel Original Movies "Love Takes Wing" and "Love Finds a Home" and, most recently, "My Nanny's Secret."
Most recently, Duff appeared in "Fear Island," "Tug" and "Slightly Single in L.A" as well as the film "Foodfight!" alongside Charlie Sheen, Hilary Duff and Eva Longoria. Duff can next be seen in the feature films, "Pennhurst" and "Home Invasion."