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Jason Oppenheim urges Christine, who is pregnant with her son Christian Georges Dumontet during the first half of the new season, to take some time away from real estate.
He asks plant-based frozen food entrepreneur Emma, who has experiencing working in real estate for The Oppenheim Group, to essentially be Christine's maternity cover.
However, Christine and Emma have history, and the other agents soon realise things are still frosty between the pair.
Both women dated the same man at around the same time and they both claim he proposed to them.
The exact details about how they met is murky, with both sides claiming their own version of events is the truth.
During a lunch date with new agent Vanessa Villela, Christine says she caught her ex coming out of a gym holding hands with Emma.
She confronted them and blocked Emma from leaving the gym in her car with her own car. Emma claims Christine banged on her windows when this unfolded.
"I found out about [Christine] the day that I met her," Emma explains. "It was not pleasant. I was leaving the gym with who I thought was my boyfriend and she pulled up with her friend and was like 'Who the f*ck is this?' and started screaming 'This is my boyfriend.'"
When Christine is interviewed about her and Emma's mutual ex, as well as the current status of her friendship with Mary Fitzgerald, the new mum says: "I know this happened years and years ago, but this is all coming back to life now because I wasn't aware Mary continued her friendship with Emma after the cheating came out."
And in another twist, Christine reveals the man at the centre of her and Emma's feud got engaged to the latter two months later.
But after his relationship with Emma fizzled, he started dating fellow Selling Sunset cast member Heather El Moussa.
Fans rushed to Twitter to discuss Christine and Emma's feud and tried to unpack both of their stories.
One viewer tweeted: "So the guy was dating Christine and then Heather and then Emma?? I am so confused. Literally who tf is this guy???"
Another fan said they believed Christine's version, writing: "Am I the only that totally believes Christine’s story over Emma’s? I mean Christine has always been a private person so I don’t get why people expect her to tell everything, even if Mary was her friend then… anyways, Christine stan all the way."
A third fan called out the unnamed ex. "The real villain is Christine and Emma’s ex, tbh," they wrote.
While a fourth person shared a picture of Pete Davidson, who was engaged to Ariana Grande is rumoured to be dating Kim Kardashian, and joked he was the mystery ex. "The guy that Christine and Emma are fighting about, and who Heather also apparently dated too," they wrote in the tweet.
One other fan quipped: "The Emma/Christine story gets more confusing each time it's talked about!"
Selling Sunset season 4 is streaming now on Netflix.
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