Katy Perry's "Part of Me" is a gamble: that pop fans will follow her from the arena to the movie theater. But the film, following in the recent success of Michael Jackson's "This Is It" and Justin Bieber's "Never Say Never," should have no trouble drawing her Katy Cats to the multiplex. "Part of Me" is a concert movie, a tour documentary and "Behind the Music"-style biography all at once, a balance it strikes perfectly. Its narrative is clear: in 2011, Perry sets out on the biggest tour of her life as her sophomore album, "Teenage Dream," ascends the charts and scores a record-setting five No. 1 singles. To casual observers, Perry's rise might seem like an overnight success, a myth the film is intent on squashing. "Part of Me" peels back the fairy tale, showcasing Perry's religious upbringing, her years of label struggles and finally, her divorce from comedian Russell Brand, alongside powerhouse performances from her "California Dreams" stadium tour and gushing footage of her adoring fans.
