Visit the official site: http://itv.com/xfactor It's the X Factor: Celebrity Final and Megan is treating us to an upbeat Christmas number with X Factor winner Leona Lewis' Christmas single 'One More Sleep'. SUBSCRIBE: http://bit.ly/TXFSub Facebook: http://bit.ly/TXFFB Twitter: http://bit.ly/TXFTwi Download The X Factor mobile app: http://bit.ly/TXFapp Watch full episodes on ITV Hub (UK ONLY): http://www.itv.com/hub/the-x-factor