Katie Price, 35, was shocked and angry to hear Josie reveal her controversial plans to have an abortion in a bid to secure a place on Big Brother.
Mother-of-four Katie wrote: "Josie is still comparing herself to me but we are nothing alike. Listen up, Josie: I think you're absolutely disgusting.
"You may have the fame you crave but it's for all the wrong reasons and I'm sure your family are horrified.
"When you're older you'll look back and regret this. There's no chance of you ever being the new me - or the old me."
Josie Cunningham has now hit back, writing on Twitter: "Babe, you've got it all wrong - I've never looked up to you as a career role model, just as a hard working mother.
"I wouldn't copy you for a career, I mean - having @danebowers toe up my v***** and then leaking it as a sex tape isn't my kind of thing."
She then added: "Truth is, like most of the country - I find Emily Macdonagh a real role model. She's well educated with class.
"Pete done well."
Josie, who says she fell pregnant either by a surgeon on an escort agency date or a Premier League footballer, says she remains furious with the thousands who criticised her abortion plan even though she has now changed her mind.
“It’s every woman’s right to choose. And whether people agreed with me or not, no one had the right to threaten me and publicly humiliate me the way they did.
We wonder if Katie Price - or Emily MacDonagh - will respond to Josie Cunningham's latest comments?