Visit the official site: http://itv.com/xfactor We love watching the Judges tap along to any of the contestant's performances, but nothing surprised us more than seeing Louis Walsh singing along to No Diggity. 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 Player (UK ONLY): http://www.itv.com/itvplayer

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