Mary Claire "Mimi" Kennedy (born September 25, 1948) is an American actress, author, and activist, best known for her performances in television comedies. She co-starred in a number of short-lived sitcoms before her role as Ruth Sloan on Homefront (1991–93). Kennedy is known for her role as Abby O'Neil in the sitcom Dharma & Greg (1997–2002). In film, Kennedy appeared in Pump Up the Volume (1990), Erin Brockovich (2000), In the Loop (2009), Due Date (2010), Midnight in Paris (2011), and The Five-Year Engagement (2012). She is currently a series regular on the sitcom Mom, for which she received a Critics' Choice Television Award nomination.