If there's one person who knows exactly how our acts are feeling tonight - it's this young schoolgirl from America who too the US by storm when she competed in the last series of America's Got Talent. With an astounding talent, 31 million YouTube hits, a platinum debut album and a worldwide tour - it's clear that Jackie is going to be an enormous star. Making it all the way to Britain just for us - here's Jackie's UK debut, singing Nessun Dorma