It started with Sarah claiming that she and Chad Johnson were feeling 'isolated' from some of the housemates.
She explained: "I feel like there's three different groups of us. 'Cause you guys have got loads of energy and then there's us who are like in the middle who've never been around loads of people for a while..."
Jemma snapped: "No ones been around loads of people though, Sarah. You keep thinking you're different to everyone else."
Things quickly escalated as Jemma and Sarah got real person with one another.
"F**k off you little b***h, man," Jemma told Sarah, "You're so f**king negative."
"Why are you diving in like a f**king c**t? Sarah asked. "She's being a c**t?"
Jemma reacted: "Now the pretty girl comes out with the naughty words, I thought you were a little sweet innocent girl."
Sarah replied: "I am when I've not got b***y people around me like you. You're a two faced little b***h."
Jordan Davies tried to calm down the intensifying fight: "There's no need for this, it's getting nasty now."
"You little f**king sl*g," Jemma spat.
"Really? I don't shag on TV for a living," Sarah replied.
Jemma then accused: "When well we know what you do after which is a f**k load of drugs... sort your nose out."
She's a jealous little b***h," Sarah snapped.
"That silly little sl*g!" shouted Jemma as she waked away.
In the bedroom, Jemma continued to rant about Sarah to Trisha, branding her a "f**king d**k".
Meanwhile, Sarah went to the Diary Room in tears.
She accused the other housemates of being two faced and sticking together in a clique to get her out.
"I'm so sick of it... there was no need for that," she sobbed.
Celebrity Big Brother 2017 airs nightly on Channel 5.