Katy Perry: Selfies Are a Disease!

Watch out! Katy Perry is ROARing about a social media phenomenon taking over the world. Oh yes, we're talking about the selfie.

Katy Perry says selfies are a disease and refused to take one for a fan this weekend at Coachella. She relented, but only after the fan agreed to be in the photo with Perry, and not without tweeting out a message to her KatyCats.

A study recently found that selfie-taking is linked to increased narcissism and mental illness. In her mind, refusing to take the selfie and sharing a warning with her fans was probably a public service announcement, but we kind of think more pictures of Katy Perry in the world does just as much good.

It's true that a glance at Katy Perry's Instagram feed shows only a few selfies, but that doesn't stop her from being photographed while all glammed up and nearly naked for various magazines and music videos.

Take a look at some of the hottest Katy Perry photos you've ever seen.