McCartney was born in Lambeth, Lond

McCartney was born in Lambeth, London, England, the second child of Beatle Paul McCartney and American photographer Linda McCartney (1941–1998). She is named after her maternal great-grandmothers (both of Linda McCartney's grandmothers were named Stella). As a young girl, McCartney travelled the globe with her parents and their pop music group Wings, along with her siblings: older half-sister Heather (who was legally adopted by Paul McCartney), older sister Mary, and younger brother James. According to her father, the name of Wings was inspired by Stella's difficult birth.[1] As his daughter was being born by emergency caesarean section, Paul sat outside the operating room and prayed that she be born "on the wings of an angel." Wings toured from shortly after her birth in 1971 until 1980.

Despite their fame, the McCartneys wanted their children to lead as normal a life as possible, so Stella and her siblings attended local state schools in East Sussex, one of them being Bexhill College. McCartney has said that while attending state school, she was a victim of bullying, as well as being a bully herself.