"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.

Speaking on the syndicated radio show, In:Demand with Alex James, Jessie revealed that it was her detractors who inspired the song.

[2] Karen Lanza of PopCrush commented: "Hearing a song called ‘It’s My Party,’ you expect to indulge the recording artist as much as you do your bestie when she throws herself a birthday bash.

With her newly released single, Jessie J fails to take full advantage of the listener’s goodwill following the urban-edged ‘Wild,’ the well-received first track off of her as-yet-untitled second album.

With its frantic beats and eff-off lyrics, ‘It’s My Party’ aims to be a full-stop dance-floor anthem for the waning days of summer.

John Walker of MTV Buzzworthy commented: "The clip opens on our boisterous heroine alone in a hallway, where she peeps through the keyholes into two very different party scenes: the first prim and proper, the second completely OOC.

Obviously Jessie picks the fun party, where she bounces around with her newfound freak friends [including model Anita De Bauch] and breaks into the chorus: "It's my party/ I'll do what I want".