"Who's That Girl" is a song by American singer Madonna from the soundtrack album of the 1987 film, Who's That Girl. It was released on June 23, 1987, by Sire Records as the first album single. While shooting for the film, then called Slammer, Madonna had requested Patrick Leonard to develop an uptempo song that captured the nature of her film persona. She later added the lyrics and vocals to the demo tape developed by Leonard, and decided to rename the song as well as the film to "Who's That Girl".
Featuring instrumentation from drums, bass, and stringed instruments, "Who's That Girl" continued Madonna's fascination with Hispanic culture by incorporating Spanish lyrics and using the effect of double vocals. Critical reception was mixed to positive; some critics compared it to Madonna's previous single, "La Isla Bonita", while others found it forgettable. "Who's That Girl" became Madonna's sixth single to top the Billboard Hot 100, while peaking atop the charts in countries like the United Kingdom, Canada, Netherlands, Italy, Ireland and Belgium. It was also nominated for "Best Song Written for Visual Media" at the 1988 Grammy Awards and "Best Original Song" at the 1988 Golden Globe Awards.
The music video portrayed a different persona of Madonna, rather than her film character for which it was released. She's seen as a young boyish lady in search of a treasure. Madonna has performed the song on her Who's That Girl (1987) and Rebel Heart (2015–2016) tours. The song has been covered by many artists and has appeared in compilations and tribute albums. Despite being a worldwide number-one hit, the song was not included in Madonna's 1990 greatest hits album The Immaculate Collection, but was later included on her 2009 greatest hits album Celebration.
