Keeping Up With the Kardashians producers have been teasing this spat between West and her sister Kourtney Kardashian for weeks. A brief l, but the full extent the fight wasn't aired until Thursday's (March 26) premiere the reality show's latest season. 

Kim Kardashian & Sister Kourtney Throw Hands In Reality TV Fight
Frazer Harrison / Staff / Getty s

Kourtney, but this time, Kim called out her sister's work ethic. According to Mrs. West, Kourtney just doesn't work hard enough, an accusation that Kourtney refuted. "But also, if I didn't want to work my ass f and I wanted to be a stay-at-home mom, that's f*cking fine you f*cking literal ****," Kourtney said before she stood up, threw something at Kim, and began assaulting her.

Kim didn't take the attack lying down and hopped to her feet to not only throw a punch, but she kneed her sister in the gut, as well. Khloé was mildly amused by the exchange, but she still separated her sisters. Kim threatened to punch Kourtney in the face while Kourtney told her if she's gonna talk about it, be about it. Then,, "How f*cking old are you?" Kourtney just continues to cuss her out. Check out the clip Kim Kardashian West and sister Kourtney Kardashian throwing blows below.