Sims was born in Oxford, Mississippi, the youngest of three daughters born to John and Elizabeth Sims. Her father (whom she never knew) reportedly worked as a porter, but Sims' mother later described him "an absolute bum" and her parents divorced shortly after she was born. She was teased for her height of 5'10 at the age of 13. Elizabeth Sims later moved with her three daughters to Pittsburgh, Pennsylvania,
