Elton to perfrom on 'X Factor' after years of berating the show

Elton John is to perform on 'The X Factor', three years after slamming the show.

The 'Rocket Man' hitmaker has been persuaded to take to the stage on the ITV programme by judge Sharon Osbourne, who recently admitted the music legend was a fan of her Over 25s category this year, but the 66-year-old singer has previously said he didn't like the series.