Actress and breast cancer survivor Christina Applegate became a new mom to a baby girl, her rep confirmed on Tuesday. "Mother and daughter are doing great," added her spokesperson. Applegate and her fiancé, rocker Martyn LeNoble, welcomed Sadie Grace LeNoble on January 27 in Los Angeles. After dating for nearly three years, the couple became engaged in 2010 on Valentine's Day. The Samantha Who? star is best known as Kelly Bundy in the hit sitcom Married With Children.