"Not Fair" is a song by British recording artist Lily Allen from her second studio album, It's Not Me, It's You (2009). Written by Allen and produced by Greg Kurstin, the song was released as the second single from the album on 19 February 2009 by Regal Recordings. The song incorporates country music as the lyrics depict sexual frustration. Contemporary critics did not positively receive the song and its theme, some calling it a "pseudo country track" and considering it a strange musical composition. The single peaked in the top 20 of the charts of some European countries and Australia, while scoring Allen's second consecutive top-five hit on both the UK Singles Chart and the Dutch Top 40 (since in the latter "Fuck You" was a commercial success before "Not Fair").

The accompanying music video portrayed a western country theme, with Allen dancing next to a microphone, while backing singers are dressed as cowgirls, accompanied by cattle and farm birds. The video was shot the same day of the release of the single. It was performed live on different occasions, including Allen's 2009 concert tour.

It was named at number 8 in the Triple J Hottest 100, 2009.

In the song, Allen describes her relationship with a boyfriend to which she describes him as "the perfect guy" yet is frustrated at his sexual laziness. She furthermore describes the situation as "Not Fair" because while he plays the perfect boyfriend in every other way, he's selfish when it comes to their sex life ("all you do is take") - thus the song gives the impression that all his niceness and concern may have been just a face to get what he wants from his girlfriend without any genuine concern with her satisfaction and happiness.

The single was officially released on January and climbed the charts, still being in the top 10 in June. The single was released as a digital download on 21 March 2009 (iTunes) and on 11 May 2009 as a CD. Allen performed it live for the first time on Ant & Dec's Saturday Night Takeaway on 21 March 2009.

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