In a new clip teasing Sunday's episode of Keeping Up With the Kardashians, all the Kardashian-Jenner siblings—minus Khloé—find out about Tristan Thompson's cheating scandal for the first time. To say their reactions are shocking is an understatement; rather, the sisters are absolutely gobsmacked by the news. Remember, Tristan was caught cheating on Khloé just days before she went into labor, which added a whole other layer of insanity to this already-surprising story.

The video opens with a shocked Kendall sharing the news with Kourtney's ex-boyfriend Scott Disick. "Stop," Disick says in response. "That's pretty serious, isn't it?"

We then see a montage of Kylie, Kourtney, and Kim reading the news on their phones. Interestingly, Kim was in the middle of interviewing a segment for KUWTK when she found all this out. "There's video of Tristan making out with a girl last night," Kim says to a producer, who's so shocked that they actually say something audible on camera: "Oh no!" "Khloé's 'gonna die," Kim then remarks.

What follows is an intense minute where the sisters decide how they're going to break the news to Khloé. No one wants to tell her, but Kylie steps up to the plate and sends her an article with the news. "No one had the courage to tell Khloé because we knew she was days away from giving birth. We didn't want to stress her out. We knew that it was the right thing to do," Kylie says. "So I'm the one that told Khloé."

Watch all this unfold for yourself, below:

Keeping Up With the Kardashians airs on Sundays at 9 P.M. ET on E!

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