The brutal trailer— which shows the harsh reality of their seemingly perfect lives— comes after reports surfaced claiming Kim and Kourtney have been butting heads off-camera and genuinely "can't stand each other".
"They can't be in the same room together," a well-placed insider told Radar Online of their strained dynamic. “Kourtney has hated Kim for a couple of years now. She thinks she’s vapid and mean."
“Their egos have clashed big time and when the cameras aren’t on, they don’t speak, “ the source continued. “There are hints of their feud, of course, but the reality is they genuinely can’t stand each other.”
While the source claims Kourtney "has much better things to do with her time than kiss up to Kim," the KKW Beauty founder believes her older sister should appreciate her more, seeing as Kourtney would "be nobody without her".
WATCH: Kim Kardashian Calls Kourtney a 'F***ing Fake Humanitarian Hoe'
Tension reached boiling point between Kim and Kourt in a recent episode after the mum-of-four accused her sister of being "ungrateful" and "stealing her style".
“Kim and I just got into the biggest fight,” the Poosh founder told her friends during last week's episode. “She just was going so crazy, she’s sending me the meanest text messages. You would die.”
“She’s like, ‘You’re the biggest, ungrateful bitch,’” Kourtney read from her phone. “So I said, ‘God, you’re such a petty woman.’"
Meanwhile, Kim unloaded to her mum Kris Jenner about their brutal screaming match.
“She just is such a bitch, like on another level,” Kim said. “Kourtney screamed at me on the phone. And was like, ‘You think I like your style? You have the lamest style.’ “