This fascinating DVD tells the definitive story of Katy Perry through interviews and onstage performances of some of her greatest hits including California Gurls Firework Ur So Gay and Hot N Cold ...

oh, let's be real, he would've loved the delectably untoward hell out of this movie. "The Substance" may not end up being for ...

MTV Unplugged offered an unusual opportunity to showcase Katy Perry's work in an exposed, undercooked way and to reveal just how much of the real her had been part of that flashy presentation.