"Stack It Up" is a song by British singer Liam Payne featuring American rapper A Boogie wit da Hoodie, released on 18 September 2019 as the fifth single off Payne's debut studio album LP1. It was co-written by Ed Sheeran and produced by Steve Mac. It is Payne's first release as a solo lead artist since 2018's "First Time". Some radio stations played the no rap version of the song.