Kourtney, Kim, and Khloé take a weekend trip toSanta Barbara, Californiato have one final trip before the baby arrives, but Kim and Khloé leave Kourtney out of everything and get drunk, upsetting Kourtney, who must abstain from alcohol. Meanwhile, Kendall signs a modeling contract and Kylie gets jealous.

The family travels to Las Vegas to celebrate Kim's birthday and attend an important business meeting. Kim bothered her mother for not caring about her birthday, while Scott gets violently drunk. He subsequently gets into a scuffle with his buddy, Rob Kardashian, who is also drunk. Their unruly behavior sets the tone for the remainder of the night. After Kris is able to break up the fight, she and Kourtney think that they are able to subdue Scott and leave him in the hotel room to sober up. To everyone's surprise, Scott shows up to the dinner where his boss is present. After using foul language, embarrassing himself and making everyone in attendance uncomfortable, Scott gets in an argument with the waiter and shoves a $100 bill in his mouth. The drama continues to unfold as Kourtney ends her relationship with Scott because of his unforgivable actions.