Leona Lewis takes the stage on "The X Factor"

The show's 2006 winner rocked classic red lips and a sleek hairstyle for the finale.

Bieber gets festive-themed performances, Pitbull showers the stage with laser beams, Leona narrates the story of the contestants, while Fiddy goes straight to the club.

By AMY JONES The singer will return to the show she won in 2006 — a launchpad which led to international stardom. Here the Londoner gives her verdict on the final acts and the series so far. "I'M really looking forward to this weekend — I'm rooting

By AMY JONES The singer will return to the show she won in 2006 — a launchpad which led to international stardom. Here the Londoner gives her verdict on the final acts and the series so far. "I'M really looking forward to this weekend — I'm rooting

The final episode of 'The X Factor (US)' aired this evening but before the winner was announced, a range of artists hit the stage to further excited the crowd. Among the performers were Leona Lewis, 50 Cent and Justin Bieber,