Thank you to r/KatyPerry, Guyism, GQ, and us for the photos above. Sometimes you mean to send someone a DM but it turns out to be a pubic post. How a group of tech-minded guys built Katy Perry's uber-popular LED bra. This article is about the American Billboard Hot 100 chart held during the 2010s. The amazing Katy Perry pictures that will make you thank genetics!