Five years ago Olly auditioned for The X Factor – this year he is presenting it.
See what the man himself has to say about the show, and why you should audition.
Visit the official site: http://itv.com/xfactor
Download The X Factor mobile app: http://bit.ly/TXFapp
Watch full episodes on ITV Player (UK ONLY): http://www.itv.com/itvplayer