The "Teenage Dream" singer, 40, welcomed a few concertgoers on stage during her Lifetimes Tour stop at the Little Caesars Arena in Detroit on Sunday, Aug. 3, and after one of them collapsed on the ground in a startling moment, Perry stayed by her side to ensure she was safe.

Katy Perry stopped her Detroit concert to help a fan who collapsed after being brought onstage: 'It's overwhelming.'

Katy Perry dealt with a scary incident on her “Lifetimes Tour” over the weekend. The “Woman’s World” singer, 40, had several young fans in the audience join her on stage for a rendition of her 2011 song “The One That Got Away” at the Little Caesars Arena in Detroit, Michigan on Sunday.