"Who's Laughing Now" is a song by the British singer-songwriter Jessie J from her first studio album, Who You Are (2011). The song was written by Jessie J, George Astasio, Jason Pebworth, Jon Shave—collectively known as The Invisible Men—Peter Ighile, Kyle Abrahams and Talay Riley, and it was produced by The Invisible Men and Ighile & James. It refers to people who have put down or bullied Jessie J and how she is living her life as a celebrity. The song was released as the fourth UK single from the album on 26 August 2011.

The song finds Jessie taking pride in her achievements in the music industry and having the last laugh at the scoffers in her younger days who doubted she could be successful. She told The Sun, "This song always makes me laugh. I have had so many supporters but also many non-believers and this track is my 'haha' to them. As I say: 'Let the haters hate, they're like way too late!'" Matthew Perpetua wrote for Pitchfork Media that "The track has her lashing out against acquaintances who she claims bullied her and dissed her early music, but now show an interest in her since she has attained some degree of success." Eric Henderson explained for Slant magazine that "Who's Laughing Now serves up a catty riposte to old schoolyard mates emerging from the woodwork, wanting to tag old photos of them together on Facebook."

The song is written in the key of A♭ minor with a tempo of 100 beats per minute in common time. The chords alternate between A♭ and G♭, and Jessie's vocals span from E♭₄ to E♭₅.

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