Read more http://swns.com - Britain's Got Talent bosses have scouted a young superstar after she was plucked from the crowd for a surprise performance - at GLASTONBURY. Excited fan Shae White, 10, was chosen to come up on stage and join popstar Jessie J during her performance of number one hit Price Tag at the Pilton festival. The huge crowd - of more than 50,000 people - were left open-mouthed when she began singing and dancing like a pro, causing some to believe the whole thing was a stunt. But the show-stealing singer was revealed to be modest schoolgirl Shae - making her first ever appearance on a stage.