The 36-year-old took to Twitter earlier this month to claim that one of the male stars of the show had attempted to hook up with her two years ago.
Although Katie mentioned no names, 27-year-old Mark Wright’s reps were quick to try and eliminate him from the equation.
They said: “Mark denies ever inviting Katie to his house or a hotel.’
So far Mark is the only person to deny Katie’s claims and now she’s hit back, adding that she has evidence.
The Sun reported that the mum-of-five said: “I still don’t want to name him. But what I will say to anyone who denies something that’s true, never deny it where I’m concerned. I’m honest.
“I always tell the truth and I always keep backups and proof of everything everything. I have a vault of evidence to prove it, if I have to.”
Closer reported this month that Mark’s fiancée Michelle Keegan, 27, was reportedly left shocked after Katie made the cryptic suggestion.
A source said: “Mark has told Michelle it can’t be him Katie’s talking about and that there’s no secret past between them.
“He says he doesn’t even know her and the pair have barely had a conversation. He’s reassured her she’s been the only girl for him since they started dating, but it’s caused tension.
“They’ve already postponed the wedding and Michelle doesn’t want any more controversy surrounding them.”
Well Katie’s mystery man – whoever he is – has been warned. And, as she always says, never underestimate the Pricey!