Born in Mount Kisco, NY. Began her performing career at the age of five and arrived in Hollywood at age 15, earning recognition as Joan Crawford's competitive daughter in the searing melodrama MILDRED PIERCE (1945). Blyth went on to appear in a wide range of films, including several musicals which exploited her schooled singing voice. She retired from films after 1957's THE HELEN MORGAN STORY and THE BUSTER KEATON STORY. Blyth returned to musical theater and the concert stage thereafter, but made occasional TV appearances, including a longrunning series of commercials for Hostess Cupcakes -- which would suggest that not too many American mothers remembered MILDRED PIERCE. In the early 1990s Blyth was still performing in regional theater and summer stock.    Nominated for Supporting Actress 1945: MILDRED PIERCE 1 nomination