I am not doing 'X Factor': Robbie Williams

London: Singer Robbie Williams has shot down rumours he is taking the fourth spot on this year's "X Factor" judging panel.

Since Louis Walsh announced earlier this year that he wouldn't be returning to the show, rumours have been rife as to who will step in - but it won't be the former Take That singer, reported Digital Spy.

"Said it once, I'll say it again: I'm unequivocally not doing X-Factor. Good luck to the show though," Williams posted on twitter.

Gary Barlow recently revealed Williams had been offered a position on the "American Idol" judging panel a few years ago, but he turned it down.