Never before has a physical fight broken out between the Kardashian sisters on their reality show but, on the most recent episode of Keeping Up With The Kardashians, exactly that happened.

Tensions were rising among family members and, when Kourtney and Kim finally got fed up with each other, they decided to take matters into their own hands… literally.

The sisters were at odds, slapping and kicking each other as Khloe Kardashian and Kendall Jenner attempted to break up the scuffle. 

Kim Kardashian West was a guest on Jimmy Fallon’s at-home version of his late-night show this week where they discussed what happened, explaining the aftermath and why things were so wild during the shoot.

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“I feel like it’s been a lot of built-up resentment from Kourtney, or just feeling like she doesn’t really want to film anymore,” said Kim about the fight. “So, she’s not the type of person to make a decision and say, ‘Okay guys, I’m not gonna film,’ but she would come to work with an attitude everyday and kind of take it out on everyone from the crew to us, and she wouldn’t really make that decision. We would just keep on pushing her to figure out why she was so unhappy. [Fighting] isn’t really what we do. When my mom saw the clip, she cried.”

Kim goes on to explain that they shut down production for a week after the fight, noting that everybody needed the break. She and Kourtney are on good terms now and Kourtney has decided to take a break from filming.

Kim Kardashian and Kourtney Kardashian’s feud has escalated to the point of physical violence, as seen in the season 18 trailer for their reality show, Keeping Up With The Kardashians. In the promo for the latest season of KUWTK, tension continues to rise between the famous sisters, who have been involved in an on-and-off feud since the previous season was filmed. The beginning of the 45-second clip shows Kourtney and Khloe having a spat in Kim’s presence, in which Khloe asks Kourtney, “why do you have to have an attitude?” Kourtney responds, “just don’t involve yourself in business that is not yours,” to which Khloe says, “then don’t talk about it in front of me.” While it’s unclear what exactly the two of them are arguing about, Khloe later gets into a fight with Kim as well, and things get heated.

In a later scene, Kourtney yells at Kim, “you have nothing to say!” before throwing a water bottle at her and seemingly pushing her sister to the ground. Kim retaliates by approaching Kourtney and telling her, “don’t ever come at me like that” before throwing a punch at Kourtney’s face. The trailer cuts to Kendall Jenner declaring, “buttons have been pressed,” and she’s definitely not wrong.

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Kourtney has been at odds with Kim and the rest of the Kardashian-Jenner clan since she revealed that she wanted to focus more on motherhood and less on making appearances on the show. Though Kourtney clarified that she wasn’t totally saying goodbye to KUWTK, her family was frustrated with her decision. Kourtney’s step back from the show has led to some major tension between herself and her sisters, who now have to pick up her slack to fulfill a certain amount of filming hours. However, Kim revealed on The Ellen DeGeneres Show in December that she and Kourtney had worked on mending their relationship, but only after they’d filmed season 18.

“What sucks is that Season 18 will come out soon, and it gets worse before it gets better,” Kim noted. “So, her and I have healed and have talked about everything, and have really come to an understanding.” All of the chaos and turmoil will be gracing our screens on March 6th, when Keeping Up With The Kardashians returns for season 18.