Katy Perry in the red

Story of her life: Katy Perry in the red

Katy Perry attends the premiere of "Katy Perry: Part of Me" at Grauman's Chinese Theatre in Los Angeles. (AP)

Katy Perry attends the premiere of "Katy Perry: Part of Me" at Grauman's Chinese Theatre in Los Angeles. (AP)

US singer, songwriter and actress Katy Perry arrives for the premiere of her documentary "Katy Perry’s Part Of Me’" in Los Angeles, California. (AFP)

Cast member and singer Katy Perry poses at the premiere of "Katy Perry: Part of Me" at the Grauman's Chinese theatre in Hollywood, California. The documentary opens in the US on July 5. (REUTERS)

US singer, songwriter and actress Katy Perry arrives for the premiere of her documentary "Katy Perry’s Part Of Me’" in Los Angeles, California. (AFP)

Victoria Justice attends the premiere of "Katy Perry: Part of Me" at Grauman's Chinese Theatre in Los Angeles. (AP)

Carly Rae Jepsen attends the premiere of "Katy Perry: Part of Me" at Grauman's Chinese Theatre in Los Angeles. (AP)

Kathy Griffin attends the premiere of "Katy Perry: Part of Me" at Grauman's Chinese Theatre in Los Angeles. (AP)

Selena Gomez attends the premiere of "Katy Perry: Part of Me" at Grauman's Chinese Theatre in Los Angeles. (AP)

Seth Green attends the premiere of "Katy Perry: Part of Me" at Grauman's Chinese Theatre in Los Angeles. (AP)