Katy Perry's latest stop on her Lifetimes Tour took a dramatic turn. Perry, 40, picked out a handful of young fans from the audience to join her band for a rendition of "The One That Got Away" during her Sunday, August 3, show at Little Caesars Arena in Detroit. However, the moment proved overwhelming for one fan, a young girl named McKenna. Footage posted via social media shows the moment McKenna collapsed on stage after the singer handed her - and three other young concertgoers - shakers.