There's never a dull moment with the Kardashian family- especially when the cameras are rolling.

In the latest episode of the reality show, airing this Sunday, things really started to get messy, this time between Kourtney, 34 and her sister Kim, 32.

Problems between the sisters arise as Kourtney's boyfriend Scott Disick, 30, is seen having lunch with the heavily pregnant Kim in an attempt to cheer her up.

It was just an innocent lunch between the two people. However, the lunch plus the fact that Scott's being too attentive to Kim when all of them together is just too much for Kourtney.

Scoot took Kim out for lunch to cheer her up and offered advice on her life.

Kris Jenner, 57, also gives advice to her daughter as she said that she was horniest after a birth of her child.

Things started to go south when Scott helps Kim around the house along with the other sisters like Kris. Kourtney comments sarcastically that Scott also helps around their house as well.

This outburst of Kourtney was out of the blue as the camera catches the other sisters looking very surprised at her behaviour.

Kris, as the mother, tried to pacify her daughters but it seems that she only made it worse. Kris defends Scott saying that it is very hard to be a young mother to which Kourtney replied that her mother had a lot of nannies while they were growing up.

Suddenly, it is too much for Kourtney as she walks out of the room. She appears to be cursing Kim as she exited, which prompted more shocked faces in the room.

The 30-second clip does not add ay further details on why Kourtney was acting like that. However, along with other reality shows, this problem will soon be resolved at the end.