Overview: After weeks of gruelling auditions, the remaining 16 contestants have reached the live rounds. Dermot O'Leary presents the first of the live shows, in which the finalists perform for the judges, the audience and the viewers at home. Gary Barlow is mentoring the boys, Kelly Rowland is looking after the girls, Louis Walsh is helping the over-28s and Tulisa Contostavlos takes charge of the groups.