Take a look back at Katy Perry's most memorable music video looks from her iconic onscreen tales
Written and filned just for her Katy Perry: Part of Me 3D documentary, the video for her ballad includes several homages to her Teenage Dream hits — and her life. "It's the labyrinth of my life of the past two years. It's got a lot of symbolism in it," the star, who divorced from Russell Brand in February 2012, said in an interview with MTV News. "It's a dose of reality."