On her lp Hide Your Heart/Notes From America. Same duo also wrote Pat Benatar's Love Is A Battlefield.
Holly Knight & Mike Chapman were familiar songwriters for Tina Turner, see: Better Be Good To Me. Although The Best fits Tina as a glove, she was not the first to try it. Her white role model Bonnie Tyler, gifted with similar river deep/mountain high pipes, predated Tina's version with a year.