During Friday night's pre-recorded show (9 January), Katie was seen using Gemma as an example of who she considers to be obese.
And Gemma was NOT happy about it...
Gemma took to Twitter after watching the conversation between Nadia Sawalha and 'most hated woman in Britain' Katie in the CBB bedroom.
When Loose Women panellist Nadia asked Katie to define what she believed to be fat, Katie replied immediately with the name "Gemma Collins".
In response, Gemma raged: "I swear Katie Hopkins fancies me !! Omg why does she keep going on about me she's an actual bully keep bringing my name up ! Come see me."
She went on to say: "Katie Hopkins fancies me ha ha ha ha ha the nutters obsessed watch her show she's the one with issues in life she hates herself !"
Gemma is referring to Katie's recent war against 'fat people' in her TLC show My Fat Story.
The designer and boutique owner for plus-sized women also shared a photo of herself with Katie smiling next to her.
Gemma continued: "Look how happy she is to be next to me she hates herself so much #CBBneedshelp #obsessed stop thinking about me babe.
"Ooo Katie Hopkins secretly must think of me Before she goes to bed #katielovesgemma #MyFatStory what a joke she was."
Take that, Katie!
Gemma, who recently took part in I'm A Celebrity, had the full backing of her fans who posted messages of support.
One said: "Go in the house and sort her out."
While another said: "Stay strong, your perfect the way you are."
I swear Katie Hopkins fancies me !! Omg why does she keep going on about me she's an actual bully keep bringing my name up ! Come see me— Gemma Collins (@missgemcollins) January 9, 2015
TOWIE pal Bobby Norris came to Gemma's defence when he tweeted: "I can't help but feel Katie Hopkins is obsessed with @missgemcollins ..She is clearly one very unhappy individual #CBB."
It's not the first time former Apprentice star Katie, 39, has criticised Gemma.
Katie labelled Gemma "the worst of reality excess" after her short stint in the I'm A Celeb jungle.
We don't think this will be the last of their feud, either!
Do you think Katie Hopkins is a "bully"? Tell us in the comment box below and you could win £50!
See the housemates arrive for Celebrity Big Brother 2015:
Copyright: WENN Lia TobyReveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!