It's a good start to a new year for Christina Applegate...she's a brand new mother! According to a statement in PEOPLE, "Applegate and her fiancé, musician Martyn LeNoble, welcomed daughter Sadie Grace LeNoble on Thursday, Jan. 27, 2011 in Los Angeles...Mother and daughter are doing great." The 39-year-old actress and 41-year-old musician have been dating