The 27-year-old spoke of her behind-the-scenes 3D film on "The Ellen De Generes Show" in the US. The film is an access-all-areas look into the life of the pop star.
"When you see the film, it's a bit scary because there's a lot of shots of me bloated with zits and normal," thesun.co.uk quoted Perry as saying. The "Teenage dream" singer admits she wanted to show a real account of her life on stage - and even her private life.
The film will also feature a "tasteful" mention of her divorce to estranged husband Russell Brand and their short marriage.