Katy Perry fan COLLAPSES on stage prompting singer to ask for 'prayers'

A young fan collapsed on stage at Katy Perry's concert. Each night on her Lifetimes tour, the 40-year-old singer invites fans on stage to help her perform the 2011 single The One That Got Away. But the excitement was too much for one young fan, named McKenna, who passed out as Perry prepared to start the song.