Recording artist Katy Perry enters University of Phoenix Stadium as she performs during Super Bowl XLIX halftime show in Glendale, Ariz. (Christopher Polk / Getty Images)
Katy Perry begins her performance. (Christian Petersen / Getty Images)
Katy Perry performs “Roar.” (Jamie Squire / Getty Images)
Katy Perry performs with metallic dancers. (Michael Conroy / Associated Press)
Katy Perry performs. (Michael Conroy / AP)
Fans watch as Katy Perry performs during halftime. (David Goldman / AP)
Singer Katy Perry performs “Teenage Dream.” (David J. Phillip / Associated Press)
Dancing sharks were part of Katy Perry’s halftime performance. (Rob Carr / Getty Images)
Katy Perry’s own group of dancers joins in. (Christopher Polk / Getty Images)
Katy Perry performs among lighted balls. (Ben Margot / AP)
Katy Perry, left, and Missy Elliott perform during halftime. (David J. Phillip / Associated Press)
Katy Perry performs with Missy Elliott and her dancers. (Jamie Squire / Getty Images)
Katy Perry and Lenny Kravitz perform “I Kissed a Girl.” (Christian Petersen / Getty Images)
Katy Perry, with a star above her, performs. (Brynn Anderson / Associated Press)
Katy Perry performs. (Christopher Polk / Getty Images)
Katy Perry soars above the crowd. (Kevin C. Cox / Getty Images)
Fireworks go off as Katy Perry performs. (Jamie Squire / Getty Images)
