Kourtney Kardashian and Kim Kardashian West are at it again.

The famous siblings have shocked fans with their behind-the-scenes feud that has been shown on the latest season of Keeping Up with the Kardashians, which premiered a few weeks ago.

Their first big blow-out came in the season premiere where Kim infamously labelled her older sister the "least interesting to look at" and now Kourtney is dissing her sis over her ex-boyfriend Scott Disick.

In episode four of the season, which premiered in the US last night, there's family tension surrounding their annual Christmas Eve party and who should make the guest list.

Kendall Jenner is upset with Kim and their mum Kris Jenner for not inviting her dad Caitlyn Jenner, while Kris plans to invite Kourtney's ex Scott Disick.

When Kendall asks why her dad isn't on the list, Kim - who has expressed her disliking of Caitlyn for some time now - bites back, saying "Scott has never done anything mean or said anything negative, so that's different."

Openly hurt by her sister's comments, Kendall snaps back "Is that actually a joke? They've both done f**ked up things in different ways." Whew!

While not oblivious to her dad's past comments or behaviour, it's understandable that Kendall is annoyed and she certainly holds her own up against her mum and Kim.

Later she discusses the issue with Kourtney, who is annoyed that Kris is adamant to have Scott at the party because of their friendship, and Kendall agrees.

When supermodel Kendall tells Kourtney that her then-boyfriend Younes should attend the party and Scott should only see them on Christmas morning with the kids, Kourtney expresses some harsh opinions about Kim.

Making it clear that they are still not on great terms, Kourtney says Kim is "bitchy and entitled" as she believes it should be her decision if Scott is invited or not.

Drama! Drama! Drama! When will the sisterskiss and make up?! We can't take much more of this...

Words: Ross McNeilage