Jean is best known for replacing Diana Ross as the lead vocalist with the Supremes in late 1969. She sang on many of their early 70's hits Up the Ladder to the Roof, Stoned Love, Nathan Jones, Bad Weather as well as Floy Joy and Automatically Sunshine with Mary Wilson, and River Deep Mountain High with Levi Stubbs. Jean left the Supremes in 1973 due to her Jehovah Witness religion, eventually being replaced by Scherrie Payne. Fourteen years later she would line up with Scherrie and Lynda Laurence as FLOS (former ladies of the Supremes), touring and recording for the Motorcity label, and in 2004 she released a biographical DVD Through the Eyes of a Supreme.