Robbie Williams will perform on 'The X Factor' final.

Robbie Williams

Robbie Williams

The 44-year-old singer is a judge on the panel of the ITV show this year, alongside his wife Ayda Field, One Direction star Louis Tomlinson and head judge Simon Cowell but Robbie has promised his fans he will also take to the stage.

He said on Instagram: "I see myself making an appearance onstage for the final. I'd love to duet with Cher."

And Louis and Robbie have already revealed that they are planning a special performance together.

When asked previously if the two would sing together, Robbie said: "I'd like to," while Louis added: "When? Does that happen on the show?! Definitely up for it!"

Simon's added that the pair were "absolutely" going to perform together.

While Robbie will perform on the show, he has reportedly been left disappointed after his Take That bandmates chose rival 'Strictly Come Dancing' for their performance of a new track from their greatest hits album.

A source previously said: "The Take That boys have been very torn between singing on 'Strictly' or 'X Factor', especially with Rob now being a judge on 'X Factor'. Given 'Strictly's huge ratings they decided they were a better fit to the BBC show. Rob will be gutted."

And the snub is a double blow for 'The X Factor' as lead singer Gary Barlow, 47, was a judge on the show between 2011 and 2013.

Gary - who will perform on 'Strictly' with bandmates Mark Owen and Howard Donald - previously warned Robbie that the job is exhausting and the editing can be ruthless.

He said: "It's going to be great, but I know what's to come with that show. I know what it does to you. He's got some hard work ahead, that's for sure. I've told him it's a lot of hours - more than people realise. It's tiring.

"They film you for eight hours until you've had enough and then you say something bad - and that's what they use when it goes out.

"You're definitely going to see him turning the air blue, so tune in. He'll be disappointed if they don't let him."

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