Katy Perry is on the cover of Seventeen's September issue! Fresh from hosting the 2010 Teen Choice Awards, Katy Perry shares that her style has changed. In the behind-the-scenes video of her cover shoot she says, "I'm like different versions of myself." She also says that trends shouldn't matter because "you're worth a lot more than just a t-shirt, a pair of shoes, or an accessory. It's very priceless, your personality." See more on Seventeen.com.