@blacchyna / Instagram 1 / 9
@blacchyna / Instagram 1 / 9

You kind of knew the peace wouldn't last. While Blac Chyna and fiancé Rob Kardashian are reportedly thrilled to be welcoming a baby, the momma-to-be isn't happy with one very key member of the Kardashain clan: Rob's mom, Kris Jenner.

Chyna is convinced that the Kardashian-Jenner matriarch is the one who leaked the news to celebrity website TMZ, effectively stealing her moment.

"Chyna thinks that Kris leaked it to them, and she is furious," a source told Us Weekly.

According to multiple outlets, the makeup model was planning to announce her pregnancy news on Mother's Day, but was forced to confirm the news two days early via Instagram.

The tensions between Chyna and Rob's family have been well documented. The family's less-than-thrilled reaction to his engagement was caught by "Keeping Up With The Kardashian" camera crews.

"He proposed in front of her whole family? That's so f----- up," Khloe Kardashian says when she hears the news. We hear one of the other sisters yell, "Nooooo!"

The clip also shows Rob and Kim Kardashian West in a very tense telephone conversation, in which he tells her that he doesn't want there to be any fighting between his sisters and his lady love, who has been a family frenemy in the past.

"You make sure your girlfriend doesn't publicly bash your sisters!," Kim tells him about her one-time pal.

The video ends with Rob having a combative sit-down with his three older sisters.

"Listen to the hostility in your voice, that's exactly why I don't say anything," he tells them. "This is the first time I ever proposed to someone in my life, don't come at me with some bulls---!"

There's no denying that Rob and Chyna's relationship has moved at a breakneck pace. The couple was rumored to have started dating in late January, much to the chagrin of his family, particularly Khloe, who has seen Chyna as a thorn in their side. Two months into the romance, Rob proposed to his girlfriend with a $325,000 7-carat diamond ring. Now, a baby is on the way.

It will be the first child for Rob. Chyna shares a 3-year-old son, King Cairo, with Tyga, who dates Rob's half-sister Kylie Jenner.

One big question remains about whether Rob and Chyna will get married before of after their child is born.

According to Us' source, they are considering a family-oriented wedding in Mexico or the Bahamas, but a quickie wedding or elopement is not out of the question.

Something tells me there's going to be lots to keep up with with this famous family.