Linda Denise Blair (born January 22, 1959) is an American actress. Blair is best known for her role as the possessed child, Regan, in the film The Exorcist (1973), for which she was nominated for an Academy Award and won a Golden Globe. She reprised her role in Exorcist II: The Heretic (1977). She portrayed Diana Ballard in Supernatural series in season 2 episode 07 . Filmography Film Television