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Katy Perry to reveal all on Russell Brand marriage

Pop star Katy Perry's upcoming 3D film will reveal all about her marriage to Russell Brand.

The I Kissed a Girl hitmaker, who split from the British funnyman last year (11), shot documentary and concert footage for Katy Perry: Part Of Me while the couple was together, and she's decided to include details of her relationship breakdown in the movie.

During an interview on The Ellen DeGeneres Show, Perry says, "I thought it was important for me to show everything in between (the marriage and divorce). Sometimes people think that we're perfect and we know we're not at all.

"I think it's important to start breaking down the idea that to achieve your dream you have to be perfect or flawless or live in a fantasy world. So that's why I decided to put everything into the film in the most tasteful way. Mostly it's about how I got there and the ride along the way which can be bumpy but mostly is extremely fun."