Claim: Sister Act is a movie.

Kathy Ann Najimy -LRB- born February 6 , 1957 -RRB- is an American actress and comedian . She is best known for voicing Peggy Hill on the animated television series King of the Hill , and her roles as Sister Mary Patrick in the comedy film Sister Act , Mary Sanderson in the comedy-horror film Hocus Pocus , and Olive Massery on the comedy series Veronica 's Closet .  Prior to her film work , Najimy was best known for two Off-Broadway shows with Mo Gaffney working as the duo Kathy and Mo. . One of the shows became an HBO comedy special and garnered Najimy her first nationwide fan base .