As part of a task in which everyone was asked questions that needed to be answered honestly, the housemates were quizzed on whether any of the other celebrities had a case of the green-eyed monster...
Gemma was the only housemate to say yes.
She explained: "In the house there are certain people bitching and moaning about me, so there has to be a hint of jealously."
Gemma, 34, has rowed with a few celebrities in the house, most notably Stephanie Davis and John Partridge.
The TOWIE star angered Stephanie when she said it was a "disgrace" that Stephanie had kissed Jeremy McConnell when she had a boyfriend waiting for her outside, while she's called John two-faced and said she disapproved of him nominating his house pal Darren Day last week.
Her relationship with former EastEnders star John is particularly fraught right now: he's branded her a "monster" and said she ruined the whole CBB experience for him.
We'll see the full task on tonight's episode.
Tonight, Wednesday 20th January 9pm on Channel 5