"You're My Number One" is a song by S Club 7, released as the fourth and final single from the band's debut album, S Club on 13 December 1999. In the UK, the single was released as a double A-side with "Two in a Million", peaking at #2 on the UK singles chart. It was the first S Club 7 single to be released as a double A-side, later followed by "Say Goodbye" and "Love Ain't Gonna Wait for You" in 2003. "You're My Number One" is described as a fun up-tempo retro number.