Mary Louise Weller (born in New York City) is an American actress. She is perhaps best known for her role as Mandy Pepperidge in the popular 1978 film Animal House. She has also guest-starred in such television series as Starsky & Hutch, Fantasy Island, B.J. and the Bear, Supertrain, and CHiPs as well as appearing in Larry Cohen's cult classic film, Q. Mary Louise Weller was born in New York City and was raised in Los Angeles' Westwood area. The onetime top New York model made her film debut with an uncredited role in the 1973 Al Pacino cop drama Serpico. In 1978 Weller starred as a beautiful marine biologist in the made-for-TV film, Hunters of the Reef and then as professor Andrew Prine's college student lover in the haunted house horror film The Evil. Mary Louise achieved perhaps her greatest enduring cult movie popularity with her performance as snooty and uptight sorority snob Mandy Pepperidge in the hit comedy Animal House. In an interview with James M. Tate, Weller admitted that she wasn't the first choice for the part of Mandy Pepperidge.