Clea Helen D'Etienne DuVall (born September 25, 1977 ) is an American movie and television actress. She has been in the movies "But I'm a Cheerleader" (1999), "Girl, Interrupted" (1999), "21 Grams" (2003) and "Zodiac" (2007). She is also in the television series "Carnivàle" and American Horror Story: Asylum.