Dermot O'Leary presents the grand final of this year's competition. The moment of truth arrives as the most popular singer or group is crowned 2017's X Factor winner, receiving a lucrative record contract into the bargain. As ever, the judges will be rooting for their respective categories - Simon Cowell with the groups, Nicole Scherzinger with the overs, Sharon Osbourne with the girls and Louis Walsh with the boys - and there will be another live performance from a big celebrity name.