Number 1 Angel was a mixtape by the British singer and songwriter Charli XCX, released in 2017. The record appeared between her regular albums and showcased her experimental, club-culture-oriented pop sound. Charli XCX collaborated with various guest artists and producers from the hyperpop and electronic scene. Tracks such as "3AM (Pull Up)" and "Lipgloss" underlined her role as an innovator within mainstream pop. The mixtape reinforced her reputation as a boundary-pushing pop artist.