First recorded by Helen Shapiro (February 1963).
Also recorded by The Crystals (unreleased 1963), The Paris Sisters (1966).
Hit version by Lesley Gore (US #1/R&B #1 March 1963).
From the wiki: “The first recording of the song was by Helen Shapiro for her Helen in Nashville album recorded in February 1963 with Shapiro’s regular producer Norrie Paramor, and Al Kasha. Shapiro would recall: ‘Right from the first time we heard the song on the rough demo back in London, we thought we were going to sock them between the eyes with that one’; however Shapiro’s version was not one of the cuts chosen as an advance single from the album … so, by the time of the album’s release in the UK that October (and the album’s first single, ‘Woe is Me’, in the US in May 1963), Shapiro’s ‘It’s My Party’ recording was perceived as a cover of Lesley Gore’s hit single even though Shapiro’s version was the first recorded.