Justin Bieber, Leona Lewis, Pitbull & 50 Cent Perform at 'X Factor USA' Finale!

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Pop stars Justin Bieber, Leona Lewis, rapper Pitbull (accompanied by Ne-Yo), and last minute-added act 50 Cent, were the celebrity guest performers on the grand finale of the first season of 'The X Factor USA' on Thursday night (December 22nd) - The Canadian teen pop star sang a medley consisting of his 'Under the Mistletoe' cuts; "The Christmas Song" (with Stevie Wonder) and "Santa Claus Is Coming to Town" (with a few lines sang by contestant Drew. So sweet!), Leona wowed everyone with her impressive vocals singing her cover of the Snow Patrol song "Run", Pitbull and Ne-Yo got the party started with "Give Me Everything", and finally 50 Cent, came out of hiding, to perform his new single "Wait Until Tonight" (with Astro!), taken from his G-Unit-hosted mixtape 'The Big 10', as well as his smash 'In da Club'. Enjoy!

What do you think of these performances?