Pop star Katy Perry posts photo of her bloody knee injury sustained during a slide on stage in Canada.

Pop star Katy Perry shared a photo on Instagram of a bloody knee injury sustained during her Lifetimes Tour in Canada. The gash on her right knee and surrounding bruises came from a slide on stage that typically causes minor pain but this time led to a more serious injury. This incident follows her helping a young fan, McKenna, who collapsed on stage during a Detroit concert. Perry's tour has also seen a mechanical butterfly prop malfunction in San Francisco, though no one was hurt. Despite these mishaps, Perry continues her tour.