Patricia Quinn , Lady Stephens ( born 28 May 1944 ) is a Northern Irish actress and singer best known for her role as Magenta in the film `` The Rocky Horror Picture Show '' ( 1975 ) , and the original stage play from which it was adapted .
Patricia Quinn , Lady Stephens ( born 28 May 1944 ) is a Northern Irish actress and singer . She played the character Magenta in `` The Rocky Horror Picture Show '' .