English singer songwriter Robbie Williams is set to mentor the finalists in this year's `X Factor'.Williams, 35, will also be performing songs from his long-awaited album `Reality Killed The Video Star', when the ITV show reaches the live stages of the contest in October.
Show supremo Simon Cowell, 49, has also decided to theme one of the week's as Robbie Williams Hits Week, and contestants will have to perform the star's best songs, including `Angels', `She's The One' and `Let Me Entertain You'.
Williams will meet the acts during rehearsals, and give them tips on their performances as they prepare for the big Saturday night show.
"This is a massive coup to get Robbie. We've had some great acts in the past like Westlife, Beyoncé and Britney come on the show," the Daily Star quoted a senior insider as saying.
"But Robbie will be a big ratings puller for us this year," the insider said.