Linda Blair

Linda Denise Blair (born January 22, 1959) is an American actress. She is most famous for her role as the possessed child, Regan, in the 1973 film The Exorcist, and its sequel, Exorcist II: The Heretic.

Blair appears as Regan at Brian Griffin’s trial, and does her 360-degree head-turning and vomiting at the Quahog Courthouse in "Screwed the Pooch".