Jessica Louise Nelson is an English singer. She rose to prominence as a member of the girl group Little Mix, which was formed during the eighth series of The X Factor in 2011. As part of Little Mix, Nelson achieved seventeen top-ten hits and five number-one singles on the UK Singles Chart.

Little Mix are an English girl group, formed on the British version of The X Factor, and the first group and only girl group to win the series. The line up consisted of Leigh-Anne Pinnock, Jade Thirlwall, Perrie Edwards, and originally Jesy Nelson, before her departure from the group in 2020. Regarded as the show's most successful winning act, their success led to a girl band renaissance in the UK. Little Mix's vocals and harmonies have garnered critical acclaim and the band are ranked amongst one of the best vocal girl groups. They were often dubbed by some media as the "biggest girl group in the world", before going on a hiatus in 2022, allowing its members to pursue solo projects.