That same day, the 28-year-old singer made an appearance on The X Factor UK to perform her hit single “Roar” while John, 36, was performing at the O2 Arena as part of his Born and Raised Tour – Check out her performance below!
Make sure to listen to the full stream of Katy‘s new album Prism and pick it up in stores or when it hits iTunes on Tuesday (October 22).
Katy Perry: ‘Roar’ The X Factor UK
10+ pictures inside of Katy Perry and John Mayer leaving the Shoreditch House… More Here! »