Watch Kourtney Kardashian Slap Kim Kardashian's Face

 Keeping Up with the Kardashians is now in its 18th season.

You're going to need some drama to keep that fresh, and last night's episode had Kourtney Kardashian slap Kim Kardashian right in the face during some kind of kat fight.

Afterward, the three Kardashian sisters -- who are really looking their age --- talked about their bad feelings for each other.

Ultimately, Kourtney decided to quit the reality show.

"They’re so critical of me. Every day I’m like…why am I choosing to be in this environment? I think I just reached the point of not being able to tolerate it anymore," she said.