Shirley Ballas, Mel Gibson, Will Ferrell, Mark Wahlberg, John Lithgow, Kesha

Oscar-winning film-maker and actor Mel Gibson makes his first appearance on the show, joined by hilarious star of Anchorman Will Ferrell, actor and producer Mark Wahlberg and award-winning stage and screen star John Lithgow. Plus, singer-songwriter Kesha performs Learn to Let Go. Providing there's time, Graham will also subject more audience members to the dreaded red chair - so their stories had better be good.