Kourtney Kardashian Throws Water Bottle at Kim During Fight on 'KUWTK' - Watch!

Kourtney Kardashian and Kim Kardashian got into a fight that turned physical.

The Keeping Up with the Kardashians stars, ages 40 and 39, respectively, got into the heated argument in a preview clip for the season 18 premiere of their show tonight.

The fight started when Kim criticized Kourtney and Kendall Jenner‘s work ethic.

“If I were on my death bed, I would still show up,” Kim says. “Mom is so used to me Kourtney … me and Khloe going on our death beds. You don’t care about stuff.”

“You act like I don’t do s–t,” Kourtney replies. “You have this narrative in your mind. I will literally f–k you up if you mention it again. Literally, shut the f–k up.”

“But also, if I didn’t want to work my ass off and I wanted to be a stay at home mom, that’s f–king fine,” she adds before throwing a water bottle at Kim Kardashian.

Watch the video now.

If you missed it, find out why Kourtney Kardashian deleted her son Mason Disick‘s Instagram.