The pair come to blows in an explosive argument to be shown in Wednesday night's show which sees chaos erupt in the house as some VERY personal insults are thrown.
Sarah and Cheryl sparked rumours they'd fallen out last month when the brunette beauty, 35, unfollowed the blonde singer on her social networking sites.
The two housemates exchange insults after reality TV star Jordan Davies questioned Harding over comments she had made earlier in the day.
This prompts Jemma to interrupt and tell Sarah: 'But no-one's been around loads of people though, Sarah. "You keep thinking you're different to everyone else".
Emma asked her: "One thing I do have to ask you about is we've just heard you say you don't like confrontation".
Meanwhile, angry Chantelle went on to accuse Jemma of having "no loyalty", alleging: "She's obsessed with herself, she's all about fame".
Sarah attempted to clarify her statement by claiming that, she thinks, there are three different groups in the house - the loud, the quiet and the ones in the middle. As if I'm too busy speaking.
She asked: "Did you fall out?" to which Harding responded: "It's not for me to say".
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The singer responds 'Why are you diving in?' before cursing at Jemma.
"I have the upmost respect for spirits, but you don't know what's going to happen and that's the fear".
"I'm used to being on my own, not with a large group who act like kids and are constantly told off by you guys". "You're a two-faced little bitch".
Celebrity Big Brother continues tonight (2 August) at 9pm on Channel 5.
Jemma reacted: "Now the pretty girl comes out with the naughty words, I thought you were a little sweet innocent girl".
Before heading into the Borehamwood bungalow last week, Jemma opened up to Closer magazine about her addiction to plastic surgery.
But although she was saved from eviction, she is now seeking help from the show's health professionals behind the scenes and has "time away" from her fellow celeb housemates.
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