Allison Brooks Janney (born November 19, 1959) is an American actress. She is best known for play C.J. Cregg on the television series The West Wing (1999–2006) and Bonnie Plunkett on CBS sitcom series Mom. In Two and a Half Men, she played the role of Beverly, Alan's date in network, in the season 4 episode "My Damn Stalker".