Released: August 10, 2013
Chart Peak: Number One (Two weeks)
This spunky anthem stomped up the charts leaving a flurry of silly controversies in its wake. First Perry was accused of jacking the tune of Sara Bareilles' "Brave" (though not by Bareilles herself). Then moombahton producer Dillon Francis claimed she stole the concept of an emoticon-centered video from him. Finally, fans of the Cincinnati Bengals were outraged to hear their team play such an unmacho track during the player introductions.