Kathy Ann Najimy (born February 6, 1957) is an American actress, most notable as Olive Massery on the television series Veronica's Closet, Sister Mary Patrick in Sister Act and the voice of Peggy Hill on the animated television series King of the Hill. Prior to her film work, she 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.