Katherine Marie Heigl (born November 24, 1978) is an American actress and former fashion model. She is best known for her role as Dr. Izzie Stevens on the ABC television medical drama Grey's Anatomy from 2005 to 2010, a role that brought her recognition and accolades, including the Primetime Emmy Award for Outstanding Supporting Actress in a Drama Series in 2007.

She started her career as a child model with Wilhelmina Models before turning her attention to acting, making her film debut in That Night (1992) and later appearing in My Father the Hero (1994) as well as Under Siege 2: Dark Territory (1995). Heigl then landed the role of Isabel Evans on The WB television series Roswell (1999–2002), for which she received nominations for Saturn and Teen Choice Awards.