It's no secret perfect strangers Milly and Karolina are chalk and cheese.
The unlikely pair, who was thrown together by MKR producers, has had a tough journey in the competition.
The drama reaches the boil on tonight's show when Milly and Karolina finally enter the kitchen together for the first time.
WHO can exclusively reveal the duo were forced to soldier on in the competition despite going head to head in an explosive argument behind the scenes.
"We had our moment," Karolina tells WHO.
"I was not happy. Then she was like, 'Don't talk to me like that.' I said, 'Well, actually, don't you f****** talk to me like that. How about that? I'll f****** show you!'"
While the argument wasn't caught on camera, Karolina chalks the incident up to exhaustion and mounting pressure ahead of their instant restaurant.
"Look, ultimately when you're tired and you've been doing these instant restaurants, "Karolina says.
"There are some very stressful times.
"Millie is genuinely a woman I do get along with because there has to be that sort of chalk and cheesy thing with me for it to work, for it to be a good relationship because there can't be two of me, right?"
For more exclusive revelations from controversial contestant Karolina, listen to the newest episode of reality TV podcast Real Talk with Holly & Ali below.