United Kingdom, Aug. 9 -- Katy Perry has revealed the bruises and scrapes she has sustained while performing on her Lifetimes tour.

In an unfiltered glimpse into the physical toll of life on the road, the singer, 40, posted a series of photos on Instagram, including a close-up of her knees covered in fresh wounds as she relaxed in a tub. Alongside the images, she shared a text exchange with her friend Lauren Glucksman, explaining the injury.

Katy said: "It was a slide on my knees mome(nt) that usually makes them go ahhh and it just made me go arghh."

Lauren responded: "And just like that she's in her 40s."

Dark Horse singer Katy's injuries are the latest setback during her ongoing world tour.

Last month, she narrowly avoided a seriou...