50 Cent To Appear On "The X Factor" Alongside Stevie Wonder & Justin Bieber

50 Cent is scheduled to appear on FOX's The X Factor tonight (Dec. 22).

The G-Unit honcho will grace the stage alongside fellow performers Justin Bieber, Stevie Wonder and Leona Lewis. The results show will be the finale for the season.

Additionally, L.A. Reid, who tapped Fif for the gig, "still has a couple surprises up his sleeve," according to Billboard.com. Recent performers on the show include R. Kelly, Avril Lavigne and Alanis Morisstte, each of whom appeared on last night's episode.