VIDEO : Katy Perry Performs for the First Time After Her Split With John Mayer

Katy Perry's first performance since her split with on-and-off boyfriend John Mayer was anything but somber. In fact, when the "Firework" singer took the stage during the Starkey Hearing Foundation's So the World May Hear Gala at the St. Paul River Centre in Minnesota Sunday, she smiled from ear to ear. Perry and Mayer reportedly called it quits once more a week ago. No reason was given for their latest split, but the two are known to break up only to make up and break up again.