Katy Perry perhaps took a page from her frenemy Taylor Swift's book and attempted to trademark the iconic Left Shark from her 2015 Super Bowl performance -- only she was denied.
After a powerful message from both President Barack Obama and a domestic abuse survivor, Katy Perry delivered an emotional performance of 'By the Grace of God' at the 2015 Grammy Awards.
Katy Perry showed the world that she is, indeed, a "firework" as she lit up the University of Phoenix Stadium during the 49th Super Bowl halftime show in front of millions of viewers worldwide.