The fourth live show of The X Factor season features one of the most successful British singers ever to emerge from a TV talent show.

Will Young first found fame in 2002 on ITV1's Pop Idol, The X Factor's sister show (Simon Cowell was one of the judges)!

It's been six years since Will scooped victory, and now promoting his fourth studio album Let It Go, he's heading back to the stage where it all began!

The perennial favourite will be joining this year's hopefuls on Saturday night, and while his new single is bang up-to-date, the 2008 contenders are dusting off their platforms and looking out the lycra as everyone prepares to celebrate disco week.

Singing songs from the seventies always throws up a host of must-see moments.