In the hot seat, winning money for their favourite charities, we have some familiar faces from past series of Britain's Got Talent - all hoping to get to that magical million. First to take centre stage will be operatic singing star Paul Potts, winner of BGT in 2007. He’ll be teaming up with pop sensation Shaheen Jafargholi. Paul will be aiming to hit the jackpot for Treat Trust Wales and Shaheen has chosen to support Teenage Cancer Trust. Next in the spotlight will be dynamic dance duo Twist and Pulse, who will be competing on behalf of Dance Aid. Finally, father and son duo Demetrios Demetriou and Lagi Michalakis, otherwise known as Stavros Flatley, play for their chosen charity Walking with Giants. The live semi-finals of BGT start afterwards at 8.00pm.