All I Want For Christmas Is You Mariah Carey
Union J are Jamie Hamblett 24, George Shelley 19, Josh Cuthbert 20, Jaymi Hensley 22.
Union J first appeared on the X Factor as a 3 piece, under the name Triple J. They then met George at boot vamp to become Union J. Louis Walsh as their mentor.
Check out the lads performing Labrinth and Emeli Sande's Beneath You're Beautiful on X Factor.