Who's Laughing Now is the seventh song from Jessie J's debut album, Who You Are. Who's Laughing Now was also released as the album's fourth official single, following from "Nobody's Perfect".
The song was written by Jessie J, The Invisible Men, Parker & James and Talay Riley and was produced by The Invisible Men and Parker & James. Who's Laughing Now peaked at number sixteen in the United Kingdom, giving Jessie J her fourth consecutive top-twenty hit but failing to reach the top ten. It failed to contribute to Jessie's record of being the first British female to have six top-ten singles from one album and was the only official single from Who You Are not to do so.