Katy Perry

You don't have to admire Katy Perry's music to admire her. The girl is an absolute marketing genius (or has marketing geniuses on staff). She is performing at halftime of the SuperBowl--likely the biggest audience she will ever have--and she's using the opportunity to sell her stuff on YouTube, Twitter, and more.

Variety has the details.

You can't go into a store for girls without running into Katy's merchandise. We even saw it when we were in Switzerland last summer.