This week Ant and Dec are joined by Lewis Hamilton, who will be racing into the Star Guest Announcer booth.With the help of Simon Cowell, Ant and Dec go Undercover to take on Piers Morgan and global superstar Michael Buble gives an exclusive performance in the End of the Show Show‘A' list superstars will also be joining the fun live in the studio, and not even the world's biggest stars are safe as the Geordie duo lead some of their most ambitious celebrity set-ups to date.One lucky member of the studio audience will also be given the chance to play for the contents of a commercial break in Win the Ads, with spectacular prizes including cars and holidays on offer.