This week, Katie has been seeking help in tracking down internet users, who posted nasty comments about 13-year-old Harvey, whose medical problems include the rare genetic condition Prader-Willi, autism and visual impairment.
Now mother-of-five Katie has penned an open letter published in The Sun, saying she is "on a mission" and is "not going to stop" until she names and shames them all.
Katie wrote: "I woke up to a disgusting message from one person which said: 'I f***ed Harvey up the a***'. You know what? I'm not having this. I've had enough.
"You don't do that to anyone, and when it becomes about my son I will always run to defend him. It would upset me if I read it about someone else's child, let alone my own. Some of these people have been doing this for a while and they're the ones I'm going after... Even the people who comment and laugh and share it are disgusting."
Katie said there needs to be a "proper verification process" for users on social media, to identify trolls more easily.
The 37-year-old, who revealed she has already received apologies from some of those users, said she wants them to "meet Harvey and talk to him and I want to ask why they did it".
Katie, who is also mum to sons Junior and Jett, and daughters Princess and Bunny, added: "Trolling is bullying, it's torturing — it comes in all different categories but it's all the same. They're hurting people."
Just last week, Katie spoke on Loose Women, saying it was hard work but so rewarding raising a disabled child.
"If I got pregnant again, and they said your child will have disabilities, I would definitely keep it and I would adopt a child with disabilities," she said.
"Until you're in that situation, you don't know. I absolutely love Harvey so much and I would never change anything about him. Yes, it's challenging but also rewarding. He's a great character and I love him and I don't think anyone should be ashamed at all having a child with disabilities."
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