PHOTOS: 'X Factor' behind the Scenes: the Top 11 Work Out the Week's Performances

L.a. Reid has now added rapper 50 Cent to the mix. And an inside source tells The Hollywood Reporter that the producer and men’s team judge "still has a couple surprises up his sleeve."

The Grammy-award winning rapper, writer, and producer joins already reported guest performers  for Thursday: Justin Bieber, Stevie wonder, and Leona Lewis.

PHOTOS: get to Know 'X Factor's' Top 17 Finalists

Sources tell THR that Wednesday's performance show will also include some celebrity guest star performances. Avril Lavigne will duet with Chris Rene, Alanis Morissette will be paired with Josh Krajcik and R. Kelly will sing with Melanie Amaro.

So, what else, or should I say who else, could the show have planned for Thursday?

Email: Jethro.Nededog@thr.com; Twitter: @TheRealJethro

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