6. Katy Perry
Twitter Handle: @katyperry
Twitter Followers: 34,755,498
Facebook Likes: 52,046,341
Fan Base Nickname: KatyCats
Best Fan Account:@KatyPerryDaily
Craziest Fan Moment: After Katy Perry and Russell Brand were divorced, a fan vandalized a billboard on Sunset Boulevard promoting Brand's latest show with "I'd rather watch the Katy Perry movie."
Katy Perry is that All-American pop star who is idolized in a way that hasn't been seen since the days of Britney Spears. Her fans are obsessed, and she's constantly giving them more reasons to be.