Mary Claire \"Mimi\" Kennedy 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 the ABC drama series, Homefront. Kennedy later co-starred in The WB prime time soap opera Savannah.\nKennedy is best known for her role as Abby O'Neil in the ABC sitcom, Dharma & Greg. In 2013, she began starring as Marjorie Armstrong in the CBS sitcom, Mom. In film, Kennedy appeared in Pump Up the Volume, Erin Brockovich, In the Loop, Due Date, Midnight in Paris, and The Five-Year Engagement.