It was confirmed yesterday that Ne-Yo and former X Factor champion Leona Lewis would both be the first stars to sing on the live shows, which start on October 6 and 7.
Other names set to perform including Pink, Robbie Williams, Rhianna and Cheryl Cole.
And both X Factor judges Nicole and Tulisa are also expected to take to the stage, along with Xtra Factor co-host and former X Factor runner up Olly Murs.
However it'll be One Direction headlining the list of stars, with Simon reportedly hoping the X Factor finalists can boost ratings.
A source told the Daily Star Sunday: “It’s ironic that less than two years ago Simon Cowell made One Direction’s career and now he’s relying on them to help save his.
“He’s risked everything on making the US X Factor a big hit and it now faces the axe.
“Simon knows One Direction wouldn’t be here if it wasn’t for the X Factor and he now wants to use their success story to save and promote the show.
“He has ordered producers on both sides of the Atlantic to book in the best guest performers for the live shows.”