50 Cent performed at the season finale of The X Factor debuting the first live performance his latest single from The Big 10 mixtape "Wait Until Tonight" as well as bringing it back to '03 with a performance of "In Da Club" with former X Factor contestant Astro.

Justin Bieber with Stevie Wonder, Pitbull with Ne-Yo, and Leona Lewis also hit the stage for performances during Thursday's big finale.

Pitbull “International Love”/“Give Me Everything” f/ Ne-Yo

Justin Bieber “The Christmas Song” f/ Stevie Wonder/“Santa Claus Is Coming to Town”

Leona Lewis "Run"

[via MWP]