New Selling Sunset star Bre Tiesi found out that her baby's father Nick Cannon had welcomed his ninth child while filming the show.
The new real estate agent has joined season six of the LA-based property reality show and has already clashed with British star of the show Chelsea Lazkani after she brought some women from Bre's past to an open house.
But in episode four, Chelsea tells the other agents about an off-camera moment when Bre, 32, found out that her baby daddy Nick, 42, had another baby.
"So, she pulled up her phone and she turned it to me," Chelsea said.
"It said, 'Nick Cannon welcomes child with LaNisha Cole.'"
The Masked Singer host's daughter Onyx Ice was born just three months after Bre gave birth to their son Legendary Love, now 10 months old.
Chelsea tells the girls that Bre seemed "very surprised" and "very upset" after reading the news on her phone.
"This was like, completely a secret," Chelsea said.
"Ultimately every additional baby is time taken away from the bond that your child and their father is gonna have."
The women then discuss Bre's open relationship with Nick and what it means for the couple.
"Bre did say that they're allowed to have relationships, right?" pregnant Heather Rae El Moussa asks.
"But I think open relationships are based on communication and everybody being on the same page," Chelsea, who is married and has two children with Jeff Lazkani.
"If something's not adding up or something's not making sense, it's because it's not working as perfectly as one may portray it working. She's not a sister wife."
Chelsea - who has a more conventional homelife - suggests that Nick could be a "master manipulator".
In the fifth episode, Bre's relationship is still the talk of the show.
"So Chelsea was saying that Bre seemed put off or emotional about the situation, that she maybe didn't know about this," Heather says.
"Obviously, Bre is sensitive about a very personal topic," says Chrishell Stause. "She was, you know, really emotional."
But when Bre finds out that she has been the hot topic of convesation, she is fuming.
"You don't need to agree with my situation; this is my situation," she fumes at Chelsea. "I'm not going to have people in this office talk about my family. I'm not."
Later she storms off saying: "I understand the whole world is so concerned with my relationship, and you're just another person, fine, but mind your f----ing business then.
"All I'm saying is respect me. Don't talk about my business. If you're going to, we're going to have a problem."
Selling Sunset season six is currently streaming on Netflix.
