Kourtney Kardashian argued with her sisters Kim and Khloe over her partner Scott Disick's drinking, a new clip has revealed.
In a promo for the season finale of Kourtney and Khloe take the Hamptons, she can be seen raging at them for being unsympathetic to 31-year-old Scott's battle with alcohol.
Despite his attempts to stay sober, he hosts a pool party with Khloe, 30, causing friction between the two sisters.
Kourtney rages: "He's trying to stay sober and he has to take care of you guys?"
She then slams them for leaving alcohol around the house, with a shocked Kim, 34, asking: "Why, is Scott just going to take it?"
"Maybe," Kourtney replys.
When Kourtney tells her sisters they don't understand the situation, the argument escalates.
Khloe then tells mum-of-three Kourtney: "I'm going back home because you're insane! You psychopath."
Kourtney recently gave birth to son Reign Aston, and in another clip from their reality show Scott revealed how he feels about his long-term partner.
He said: I'll say after all this time and all these years we've been together, she can still surprise me and still lighten up my day and my heart."