Sister Sledge is an American musical vocal group from Philadelphia, Pennsylvania. Formed in 1971, the group consisted of sisters Debbie, Joni, Kim and Kathy Sledge.

The siblings achieved international success at the height of the disco era. The year 1979 saw the release of their breakthrough album We Are Family, which peaked at number three on the US Album Chart , and included the 1979 single “We Are Family” which reached number two on the US Billboard Hot 100 and earned a Grammy Award nomination, together with two other 1979 top 20 hits “He’s the Greatest Dancer” and “Lost in Music”.

Their other US hits include a 1982 remake of Mary Wells’ 1964 hit, “My Guy”, and other international hits include “Mama Never Told Me” (1973) and “Thinking of You” (1984), and the number one UK hit, “Frankie” in 1985.