Hottest Girl in the World is a song by English boy band JLS, released as the official lead, and second overall, single from the group's fourth studio album, Evolution. The track was released on 21 October 2012. The track is a preview of the band's new-style material, which focuses on stronger harmonies and stripped back British R&B. The song was written by the band, along with Dwayne Abernathy, Ali Tennant and Bangladesh, the latter of whom produced the track.

The track received its official radio premiere was on The Chris Moyles Show on BBC Radio 1 on 6 September 2012. Shortly after, the band's official YouTube account uploaded a short audio snippet of the track, followed by an unofficial lyric video. After the song's premiere on BBC Radio 1, fans and critics expressed their views on Twitter. Many of the reviews were mixed, with some branding it a "Justin Timberlake rip-off".

JLS performed the song live on The X Factor on 21 October 2012, as well as Alan Carr: Chatty Man on 26 October 2012.

Jon Stickler of Stereoboard.com described the song as "a sleek, modern club song, showing maturity and progression, which takes the group out of pop territory."

The music video for the track premiered on JLS's official YouTube account on 10 September 2012. The video features the band dressed in black and white outfits, performing choreographed routines throughout the video, alongside backing dancers.

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