Fans of this year’s Celebrity Big Brother will know that Luisa Zissman, 26, does not mince her words (just ask Jim Davidson and Ollie Locke), much like her fellow former The Apprentice alumni Katie Hopkins, 38.
So, when Katie tweeted an insult at Luisa, we weren't all too surprised to see that the CBB star had the perfect response up her sleeve.
It all began when Katie – who recently sparred with Lily Allen and Kelly Osbourne on Twitter – took to the social networking site to say, “Luisa. Recruited by Mumsnet to promote their latest campaign for crotchless pants. Inspired.”
Ouch - but Katie wasn't expecting Luisa's response.
The self-styled entrepreneur fired back with: “Inspired by this pic of u s****in in a field mumsnet want u2front ‘exploring nature the real way’ campaign.”
While Katie usually responds to her attackers immediately on Twitter, she's remained oddly quiet this time - suggesting that Luisa may have touched a (gasp!) nerve.
Not content to leave it there, some magazines have reported that Luisa added: “Katie Hopkins has the most miserable looking children ever – is it any wonder?”
Unsurprisingly, fans of the Ceebrity Big Brother runner-up - and haters of Katie Hopkins - have responded VERY well to the quick-thinking tweet:
Anyone else surprised / delighted to see Katie Hopkins lost for words?