The mother-of-three launched a new daytime club in Sin City on Saturday, 21 March, just before Keeping Up With The Kardashians viewers saw her and Kim clashing over Kim's mega successful mobile phone app game.
Kim wanted Khloe, Kourtney, Kendall, Kylie and their mum Kris Jenner to appear in her Kim Kardashian: Hollywood… but suggested it should be done without a fee.
Kendall, Kylie and Khloe were all up for it but Kourtney wasn't impressed to learn her likeness would be used and she wouldn't be paid for it.
She even sent Kim a cease and desist letter!
Kim was none too happy – especially when Kourtney's boyfriend Scott Disick suggested that Kim just buy Kourt some shoes in order to soften her up.
Ranting, Kim said: "It's ridiculous for you not to do this for me as a favour. I've done so much for you. For Scott to call me and say, 'Buy her a pair of shoes.' With all the s**t I've done for you? I'm not buying you a pair of shoes! I bought you a f**king career!"
At the end of the day, however, calm returned between the sisters and Kourtney agreed to be in Kim's game.
Well, calm for now... we're pretty sure another Kardashian drama will crop up soon!
All you need to know about Kourtney Kardashian in just one minute: