"Pretty Girls" is a song recorded by American singer Britney Spears and Australian rapper Iggy Azalea. Azalea co-wrote the song with Maegan Cottone, British girl group Little Mix, and the song's producers, The Invisible Men. The single was released on May 4, 2015, by RCA Records.

The music video for "Pretty Girls" premiered on May 13, 2015, and was directed by Azalea and Cameron Duddy. The visuals were inspired by the 1988 film Earth Girls Are Easy, starring Geena Davis. The song was performed live by Spears and Azalea for the first time on May 17 at the 2015 Billboard Music Awards. Later that year, it was added to the setlist for Spears' Las Vegas residency show, Britney: Piece of Me.

The collaboration peaked within the top 20 in the United Kingdom and Canada and the top 40 in the United States, France and Australia. The track also received two nominations at the 2015 Teen Choice Awards.

On September 9, 2014, during an interview with Extra at The Intimate Britney Spears Collection launch in New York City, Spears revealed she had slowly but steadily started working on a new album. When asked who she would like to collaborate with, Spears said she would like to do something with Katy Perry or Iggy Azalea. Rumors began to circulate that a collaboration between the two artists was already in the works, with Azalea saying she had done a "secret collaboration" with someone she had been interested in.

In December 2014, Azalea told Kiss 108 backstage at their Jingle Ball Tour 2014 that their collaborative song would premiere in 2015, "We have a song, which is going to be her first single, coming out next year." Asked how the collaboration came about, Azalea added, "She said she would like to work with me in an interview and they reached out. We recorded a few different things and then one of those just ended up being, I think, undeniably great. Hopefully I think everybody will get to hear it at the beginning of next year." In February 2015, Azalea tweeted there were "epic" ongoing plans for the song. For Spears's Billboard magazine cover story, published online on March 12, 2015, it was reported that despite Spears being back in the recording studio as back as in September 2014 working on a duet with Azalea, among other tracks, a proper full-length album would not be coming soon. Spears further explained, "I'm gonna do [a new album] slowly but surely [...] I'm gonna try to do my best to do an amazing album, but it's not my full priority right now". Azalea confirmed the title of the track the following week. Afterwards, in Spears's cover story with People magazine, it was announced that "Pretty Girls" would be released on May 5.

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