Katy Perry: Part of Me, the singer's 3D movie documentary, hits theaters today. While it's easy to dismiss autobiographical concert films like this, the flick was well-received by several critics, just like (surprise, surprise) Justin Bieber's Never Say Never documentary shown in theaters back in 2011. According to Mick LaSalle from the San Francisco Chronicle: "Any self-produced documentary about oneself is bound to be a propaganda film, but 'Katy Perry: Part of Me' is a good one, and a…Read more at Tecca ›