Visit the official site: http://itv.com/xfactor Andy Hofton enlists the help of Robbie Williams to belt out one of his all-time classics. 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