Kourtney Kardashian left in tears after Scott introduces Sofia Richie to their kids

Last night's episode of KUWTK was turbulent.

Having found out that Scott had introduced his 20-year-old girlfriend, Sofia Richie, to his and Kourtney's children, the 39-year-old broke down.

"The thought of my kids being introduced to another woman and having somebody else in their lives, it is hard for me and hard for them. There is a lot going on for them," Kourtney revealed to the cameras.

Ringing younger sister, Kim Kardashian West, Kourtney looked visibly upset in the video admitting that she was blindsided by this move from Scott. Apparently, according to the show, the pair made a rule about introducing significant others to their kids while in therapy, despite the fact their children had already met Kourtney's then-boyfriend, Younes Bendjima. Scott then rang Kourtney's mother, Kris Jenner to discuss what Scott felt was a double standard. Kris agreed with Scott saying:

"I don't understand why she can introduce her boyfriend to the kids but you can't introduce your girlfriend, because she is my daughter I don't want to go against her, but I see your point, too, so I would ask her why it isn't mutual."

The pair then finally decided to meet to hash things out and the results were tense. Scott called Kourtney "controlling" as the pair bickered over what they believe is the "correct" thing to do. Drama.