Kelly, 35, has been soaking up the sun in Cannes (just like everyone else, it seems) and mixing with the rich and famous.
For some reason Kelly’s fun on the French Riviera is bothering Katie, 40, and she used her column in The Sun to pass comment.
She swiped: “Kelly Brook has been doing good job hobnobbing with the rich, famous and exceptionally thin in Cannes this week.
“Given she is none of these three things, I am guessing she is there to give a sense of scale – like using a coin near a small insect.”
But, unsurprisingly given her current surroundings, Kelly has chosen to ignore Katie’s scathing remarks.
Instead she’s been treating her Twitter followers to some amazing snaps from her trip.
This isn’t the first time Katie has taken aim at Kelly: last year she hit out at the actress for having ‘nothing between the ears’.
She said: “I think she does look like a chubber. I get the whole boobs thing – she’s got amazing boobs – but the rest of it? No. And there isn’t anything between the ears.
“If you looked through you could see the other side of her head.”