"It's My Party" is a mid-tempo song in the key of A major, written by Jessie J, Claude Kelly John Lardieri & Colin Norman. The song received its first radio play on Capital FM on 5 August 2013 and was released on 15 September 2013. The song shares its title with Lesley Gore's 1963 hit song. Speaking on the syndicated radio show, In:Demand with Alex James, Jessie revealed that it was her detractors who inspired the song. "A lot of the time the haters - I hate calling them haters but that's the easiest way to sum it up - they need love more so than anyone else," she said. "I don't think hate does anything for the world. It doesn't do any good. I wanted to make sure I had a song that represented what I'm about."