Does Katy Perry have the best concert costumes? E! online seems to think so. They compiled a list of Katy's best costumes from her tours, to commemorate the end of the Witness tour.
Here are a few (5) of her best:
One of the Boys / Hello Katy Tour
Teenage Dream / California Dreams Tour
Prism / The Prismatic World Tour
Witness / Witness: The Tour
Which star has the best costumes ever?