Katy Perry performs during halftime activities of Super Bowl XLIX.
Katy Perry performs ÒLast Friday Night (T.G.I.F.)Ó during halftime activities of Super Bowl XLIX at University of Phoenix Stadium in Glendale, Arizona, February 1, 2015. Photo by Art Foxall/UPI
Katy Perry performs during halftime activities of Super Bowl XLIX at University of Phoenix Stadium in Glendale, Arizona, February 1, 2015. Photo by Pat Benic/UPI
Katy Perry performs ÒLast Friday Night (T.G.I.F.)Ó during halftime activities of Super Bowl XLIX at University of Phoenix Stadium in Glendale, Arizona, February 1, 2015. Photo by Art Foxall/UPI
Katy Perry performs "Roar" during halftime activities of Super Bowl XLIX at University of Phoenix Stadium in Glendale, Arizona, February 1, 2015. Photo by Art Foxall/UPI