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4 July 2012, 14:20 | Updated: 4 July 2012, 14:33
The 'Part Of Me' star tells Capital she kept the more unflattering moments in her 3D blockbuster because it's more realistic.
Katy Perry has hit out at what she refers to as "fake Hollywood" when explaining the reasons she kept some of her "exhausted" looking scenes in her new 3D movie.
The 'I Kissed A Girl' star told Capital FM that she is pleased the film is "honest" and hopes that people will be able to see that they don't need to "fit in" to achieve their dreams.
"I'm glad that it's honest and revealing in the right way," she confessed. "Hopefully people will walk away from the movie being like 'yeh, I don't have to fit in in order to achieve my dreams."
Speaking about the more unflattering moments of the film, she added: "I thought it was important to leave those shots where I'm exhausted looking and without this [make-up] full beat because I mean I don't always look like this of course and that's not reality and I don't like to be a part of fake Hollywood – I think that's gross."
You can check out a picture of Katy on the red carpet of her European premiere in London's Leicester Square last night below:
The film hits cinema screens on 5th July and features details on her marriage breakdown to comedian Russell Brand.
The pair announced their split at the end of 2011 following 14 months together.
You can watch a video of Katy talking to Capital FM showbiz reporter Kevin Hughes below:
The American star has vowed to go into hiding when she has completed the promotional campaign for the film.
Meanwhile, Katy has also heaped the praise onto Adele following the news of the 'Rolling In The Deep' singer's pregnancy and said she was thrilled at the announcement.