Joanne Valda O'Meara (born 29 April 1979) is an English singer-songwriter, television personality and actress. Formerly one of the lead singers of pop group S Club, she launched a solo single after the group's split in 2003, which cut short the production of a proposed album following an appearance on Celebrity Big Brother.

O'Meara was born in Romford, East London, to parents Dave and Barbara. She has a brother and sister, Shane and Julie. She grew up in Collier Row, a suburban housing estate in the north of Romford in the London Borough of Havering. She was educated at Clockhouse Junior School and Bower Park School, and excelled in music, singing and dance.

In 1998, O'Meara started off her music career in the hip hop/rap group, 2-4 Family. She remained with the band for only one single release, "Stay".

In her teenage years, O'Meara would serve food at her local pub in Ilford. It was there that someone from 19 Entertainment spotted her on stage and recruited her to join a new pop group S Club 7. She was a prominent member of the British group, singing most of the group's lead vocals, as well as acting with the group in their own TV series, the group also had two reality television shows "S Club 7 Go Wild!" and "S Club 7 Don't Stop Movin'", as well as S Club's own movie, "Seeing Double".