The 36-year-old has an estimated fortune of £40 million, and, after starting out as a glamour model, has ventured into books, reality TV, fashion, beauty and hair.
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The secret behind it all? Hard work and determination. Speaking during her new weekly segment for Australia's Channel 7, Katie said: "I've always been good with my money.
"When I was younger, lots of my friends wasted their money on designer clothing whereas I went and bought my house as soon as I was old enough."
Katie's been in the industry for 20 years, but she initially didn't see her glamour modelling career lasting for very long.
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She said: "I only thought I could be a model for about two years. But, because I used my brain, I've got all these other businesses."
Knowing that modelling wasn't going to last forever, business-savvy Katie worked out where else she could turn her attention.
"There's so many people who, in this industry, get all this money and they think it's going to last forever and it doesn't. So you've got to be smart," she added.
The mum-of-five is hoping her good business sense will rub off on her children, sons Harvey, Junior and Jett and daughters Princess and Bunny.
One thing Katie is certain of is, no matter what your background, anybody can be successful.
She said: "You don't have to come from a money background to have money. You create your own path in life and that's exactly what I've done."
And what does she say to people who tell her she can't do something? "The people who knock me and say 'oh, she won't be able to do that', I'm like, 'oh really, then watch me!'"