"Ex-Girlfriend" is a song by American ska band No Doubt from their fourth studio album, Return of Saturn (2000). The song was released as the album's lead single in early 2000 and was moderately successful, reaching the top 40 in most countries it charted in, including peaking within the top 10 in Australia, Iceland, and Spain. A review from Billboard magazine called Stefani's vocal performance on the song "fantastic".