Charli is the third studio album by British singer Charli XCX. It was released through Asylum and Atlantic Records UK on 13 September 2019. Charli was preceded by the singles "1999" with Troye Sivan, "Blame It on Your Love" featuring Lizzo, and "Gone" with Christine and the Queens. Charli was also promoted by the promotional singles "Cross You Out" featuring Sky Ferreira, "Warm" featuring Haim, "February 2017" featuring Clairo and Yaeji, and "2099" also featuring Sivan. Musically, it has been described as avant-pop, electropop, futurepop, and hyperpop.

"1999" is a song by English singer Charli XCX and Australian singer Troye Sivan, released as the lead single from the former's third studio album Charli on 5 October 2018. The single cover was inspired by the 1999 film The Matrix. It follows several singles released earlier in 2018 by Charli XCX and Sivan's 2018 album Bloom. The track reached number 13 on the UK Singles Chart dated 22 November 2018, becoming Charli XCX's tenth top 40 single and first top 15 single since 2015, as well as Sivan's fourth top 40 single and his first top 20 single.