On Sunday, the 37-year-old shared a glimpse of a vintage photoshoot that saw her sport a skintight corset which highlighted her cinched waist.
After posting the sexy snap to her account with 631,000 followers, Catherine was inundated with negative comments from trolls who claimed the actress had edited her body to appear smaller.
But Catherine wasn’t holding back and publicly responded by insisting that she’s always had a “tiny waist”.
Catherine insisted that she worked “bloody hard” to achieve her incredible figure, before telling her haters to “bugger off”.
The former Strictly Come Dancing star explained that the white corset was from her Coronation Street’s character Eva Price’s wedding in 2017.
“Taken while filming Eva’s wedding – exhibit A- tiny waist- ZERO airbrushing,” she insisted.
Before adding: “This is for those negative few telling me waist isn’t real.
“I work b***y hard to have a waist. B****r off.”
In another post, Catherine went on to explain that she wouldn’t even know how to Photoshop her snaps due to the fact that she’s not technologically minded.
She admitted: “I pride myself on never airbrushing my Instagram pics. I wouldn’t even know where to start.
“I am the least technical person I know.
“For those commenting on my waist- I have always had a tiny waist.”
Catherine went on: “’I work b****y hard at the gym to stay healthy. If you’ve got a problem with my waist, I suggest you unfollow- and try to be kinder to people with small waistlines.”
The defiant actress finished off the post by wishing peace on her negative followers.
“May you find peace you negative folk. I will pray for you,” she savagely penned.