Mackenzie Brooke Smith (born February 6, 2001) is a child actress, most notable for her recurring role on Terminator: The Sarah Connor Chronicles as Savannah, the daughter of Catherine Weaver. She also appeared in the holiday motion picture Four Christmases, alongside Reese Witherspoon and Vince Vaughn. Smith can also be seen guest starring in television series like 'Til Death, Pushing Daisies, Desperate Housewives and The Middle.