Katy Perry says her marriage to Russell Brand was "extremely fun."

The "Part of Me" singer - who split from the actor in December after being married for just 14 months - says while their relationship didn't work out, she enjoyed most of their time together.

"Mostly it's about how I go there and the ride along the way which can be bumpy but mostly it was extremely fun," the 27-year-old beauty said, speaking about her new movie Katy Perry: Part Of Me 3D, which documents her time with Russell.

Katy - whose divorce from Russell will officially made final next month - says she decided to document her failed marriage in the film to show people she's not perfect: "I thought it was important for me. First of all, I thought it was important to show everything in between. I think sometimes people think that we're perfect and we know we're not perfect, at all. I think it's important start breaking down the idea that to achieve your dream you always have to be perfect or flawless or live in some kind of fantasy world. So that's why I decided to put everything into the film... in the most tasteful way."