Katy Perry's mother thinks she was affected by "demonic influences" as a child.

Katy Perry

Katy Perry

Mary Hudson - who is an evangelical pastor - has penned a parenting guide called 'Joyful Parent = Happy Home' for any mothers and fathers who are struggling to raise their kids because they're so determined to do things "their way" even though it's dangerous.

Discussing how she believes Katy and her brother and sister had been affected by "demonic influences", she wrote: "I know how difficult it can be to watch your children do things 'their way' especially when it looks like it is totally the opposite of God's way. You want to shout, 'Stop!' because you clearly see the danger ahead."

However, although she understands that the two different view points can lead to a fraught relationship, she believes "God's spirit will eventually flow through the parent and into the child, bringing them onto a path of righteousness."

In the first chapter of her book, Mary - who has Katy, Angela, 36, and son David, 29 - has admitted she had an abortion in her teenage years but is now a born-again Christian.

She also suffered with post-partum depression after the birth of her children and found herself in an "extremely dark place", but she believes a "good session of worship" is better than any medicine and that parents should turn to God before they reach for the pills.

Mary - who has made no secret of the fact she doesn't like Katy being a pop star - has blamed leading figures in pop culture for their sexually explicit behaviour on stage.

She claimed that raunchy music videos are a "cultural Armageddon" facing today's teenagers before adding that "Satan's visual attack on our youth is relentless."

Meanwhile, the 33-year-old singer has admitted it doesn't bother her that her mother Mary and father Maurice, who is also a Pentecostal pastor, don't agree with her career choice because she thinks they're "great" and she loves them.

She said recently: "My parents are great and I love them so much. I cry sometimes thinking about how much I love them. [But there are times when] they don't agree with some of the things I do and they do wish that I could do other things. And I just have to say, 'You are your own person, I am my own person, and my intentions are pure.'"

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