"Nasty Girl" is a song written by Prince. It was first recorded by his protégé girl groupVanity 6 in 1982. Prince gave the songwriting credit to lead singer Vanity, although he was the writer and composer.Inaya Day recorded a hit cover version of the song in 2004. There have also been several other versions of this song.
It was the second single taken from their self-titled debut album Vanity 6 and was released on October 1, 1982.
Due to its explicit lyrics, "Nasty Girl" met with resistance on mainstream American radio, peaking within the U.S. Bubbling Under Hot 100 Singles chart. It did, however, become a sizable hit on U.S. R&B radio and it hit number one on the U.S. Hot Dance Club Play chart. The song was knocked off the number one position by Prince's "1999". Lead singer Vanity, who is now a Christian preacher, has denounced the song and told the members of her congregation who listen to "Nasty Girl" to "keep praying for the Holy Spirit".
Inaya Day's 2004 cover of the song became quite popular. It was released in Australia, peaking at number 18 and remaining on the chart for 11 weeks  there and hit number 1 on the ARIA Club chart. It was released in the UK the same year, peaking at number nine on the UK Singles Chart.