The 'Wide Awake' singer previously teased that her 3D concert movie Part of Me would contain a "tasteful" reference to her divorce with the comedian in late December.
© Rex Features / MARCOCCHI GIULIO/SIPA/Rex Features
© David Fisher/Rex Features
The Teenage Dream superstar says in the film: "I thought to myself, 'When I find that person that's going to be my life partner, I won't ever have to choose [between the partner and my career]. They won't be threatened or have weird motives'. Then I started to realise, that's not true."
Perry, who has been dating Florence + the Machine guitarist Rob Ackroyd since April, insisted that she gave "everything it took" to save her marriage to Brand.
"I have that same belief system with everything, from career to my life to my personal life, everything. And I will do everything it takes to not fail. And I did everything it took, but it still failed," she added.
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Footage in the movie, the shooting of which coincided with her marriage break-up, features the 27-year-old crying on her bed in one scene.
Premiering last night in Hollywood, Katy Perry: Part of Me will be released worldwide on Thursday, July 5.
> Katy Perry 'had to include Russell Brand divorce in new documentary'
> Russell Brand on life after Katy Perry: 'I'm happier than ever'
Listen to Katy Perry's 'Wide Awake' below:
