Adele And One Direction To Sing At 'X Factor' Final, 15 More Most Memorable Guest Performances (VIDEOS)

The end of the ‘X Factor’ live shows means many things. It means Christmas is just weeks away *gulp*. It means the sight of Simon Cowell’s chest on a Saturday night will soon be a distant memory for another year. And it means that producers are going to bring out the big guns, to sign up some of the biggest names in the music industry to put on a show for us, all in the name of flogging their new material.

Over the years, stars as huge as Celine Dion, Paul McCartney, Elton John, Cher and the late Whitney Houston have all hit the stage to perform for ‘X Factor’ viewers (not to mention Simon Cowell…), and this year is no exception.

Four memorable 'X Factor' musical guests

Already this series, we've had Little Mix cementing their place as one of the most impressive acts in the UK music scene and Fleur East reminding us all why we fell in loe with her in the first place, while Adele, Coldplay, One Direction and last year's winner, Ben Haenow, are all gearing up to wow us all in the live final.

But which act has had the most memorable 'X Factor' guest performance ever?

Show-stopping dance routines, wardrobe malfunctions and dodgy vocals - over the years, the ‘X Factor’ stage has seen them all, and these are just some of the guest performances that have stuck in our heads from series gone by (although it’s not always for the reason the artist was hoping)...