Katie recently posted a series of videos to her Instagram account, calling on her 1.3 million followers to find a social media user who had posted mocking images of Harvey, who suffers from multiple disabilities.
'Let's see if you're a man or a mouse and face up to what you’ve done. Let's see if you can be man enough to apologise and inspire other people not to bully,' she said in one of the clips. 'If he's taking the mickey out of my son, then I wonder how many other children or people he's making fun of. He's a bully and needs to be caught.'
She then shared a similar series of videos from her son Junior, who also slammed the perpetrator and called the comments 'disgusting'.
'Do you know how heartbreaking it is? Imagine your brother or sister was paralysed, would you make fun of them?' he asks. 'It's just really hard, because I love Harvey so much, and everyone who knows Harvey, he’s such an innocent and loving boy.'
'He thinks he's got the guts to post what he said on social media, let's see if he's got the guts to apologise.'
Fans were quick to applaud Junior for his heartfelt words about his brother, with one writing: 'What a lovely brother you are Junior looking out for Harvey' and another adding 'Go Junior well said'.
'This is all what Harvey needs. Loving mother @officialkatieprice and loving brothers and sisters. Well done for speaking out Junior. I do hope this person apologises because its disgusting what he said but he won't. Strong family thats all Harvey needs' a third agreed.
This isn't the first time Katie and her family have publicly taken on the trolls in Harvey's defence: in March last year, she announced on social media that she would continue to highlight the accounts which made jokes about the 14 year old, after they declined invitations to confront her face-to-face.
Katie had challenged the offenders to come on ITV show Loose Women to talk things through or to spend time with Harvey, but her invitations were declined, resulting in her vow to continue to call out the people responsible, the Loose Women panelist said on Twitter.
So seems the trolls about my son Harvey have declined to come on loose women , so they are not sorry so I'll continue to name and shame— Katie Price (@KatiePrice) March 22, 2016
The former glamour model's battle with online trolls started after several Instagram and Twitter accounts shared images mocking Harvey, who is blind, on the autistic spectrum and also suffers from Prader-Willi syndrome - which causes him to gain weight easily.
The first image she reposted on her own account made a sexually explicit reference to the child.
'Can everyone help report this sick twisted man and if you know him give me details please he needs to be named and shamed and be questioned and clearly shouldn't be roaming around with thoughts like that about a child,' she wrote alongside.
It then emerged that there were several pictures of Harvey circulating, all accompanied by nasty jokes about both Harvey himself and his relationship with his mum.
Katie, who is also mum to Junior, 10, Princess, eight, Jett, two and Bunny, one, even unearthed a parody account of her son on Twitter, to which she responded, 'Who is allowed to set up a site like this does anybody know this person as I'm sure the police will find out.'
Who is allowed to set up a site like this does anybody know this person as I'm sure the police will find out pic.twitter.com/QPiju39ZHj— Katie Price (@KatiePrice) March 9, 2016
After urging her fans to 'please name and shame these sick people' and help her find the culprits responsible for the disgusting images, she added on the microblogging site: 'There should be more done to stop this happening to people like me and others so angry and upset'.
'I've realised so many people mocking my son out of all my children they pick on the one with disability'.
Most fans have been sending messages of support and outrage to the star, but after her initial posts, some trolls even went as far to feign shock about the fact that Katie hadn't seen the images previously.
And you can bind your beak in pic.twitter.com/c4mhMFm8ES— Katie Price (@KatiePrice) March 9, 2016
'I can't believe Katie Price has only just realised people make these pictures/videos about Harvey...' one tweeted, to which Katie replied: 'And you can bind your beak in'.