Ant and Dec present the last live semi-final of Britain's Got Talent as the final remaining nine acts compete to win the ultimate prize of 250,000 pounds and a slot on the Royal Variety Performance. They perform in front of a studio audience and judges Simon Cowell, Alesha Dixon, Amanda Holden and David Walliams. It is then up to the viewers at home to choose which acts have what it takes to make it to the final. The act with the highest number of public votes automatically goes through to the live grand final. The two runner-up acts will then face the judges, who will pick their favourite to go through to the live shows.