American chart toppers Fun wowed the judges during the fourth live results show with a rousing rendition of their hit single We Are Young.
The group took to the stage surrounded by oversized lightbulbs for their performance of the epic sing-along track, which went to number one in May this year.
Speaking to Dermot O’Leary after their action packed performance, the band said they would be back in March next year to do a proper tour of the Britain.
It is the first time the group have appeared on X Factor after shooting to world-wide fame earlier this year.
Take That singer Robbie Williams also appeared on the show performing his latest single Candy.
Earlier the contestants performed Without You as a group, with it yet to be determined which act will leave the show.
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