They were the most successful American pop group of the 1960s with twelve #1 hits that helped define a generation. The final curtain dropped for good on Diana Ross and the Supremes at Las Vegas’ Frontier Hotel on this day in 1970. Mary Wilson, Florence Ballard and Diane Ross grew up together in Detroit’s Brewster housing project and started out as co-equals in a singing group they called The Primettes. Legendary Motown founder, Barry Gordy, changed the name to The Supremes. He eventually gave Diana Ross top billing and her burgeoning solo career led to the downfall of the group.