Kris Jenner branded Kim Kardashian West a "f***ing traitor" for helping style Caitlyn Jenner.
Kris Jenner and Kim Kardashian West
The 60-year-old matriarch called her daughter to express her disapproval that the 35-year-old beauty had assisted her former spouse - who was previously known as Bruce Jenner - in her preparations for the ESPY Awards earlier this year.
In a new trailer for the upcoming series of 'Keeping Up With the Kardashians', fuming Kris said: "Kim, you are a f***ing traitor! You're not going to f***ing play this game anymore!"
Earlier in the short clip, Kim's younger sister Khloé Kardashian, 32, had explained why Kris was so angry.
She told her friend Malika Haqq: "She's so pissed that Kim was dressing Caitlyn Jenner for the ESPYs."
Elsewhere in the trailer, Khloé considered having breast implants and was seen trying out a number of temporary options as she debated the size she wanted to go.
She said: "We're in LA. People get their boobs done like they fill up a car with gas."
Scott Disick gave Rob Kardashian, 29, a hilarious lesson in childcare as he prepares for the arrival of his first child with Blac Chyna, but the 33-year-old entrepreneur seemed to run into trouble with his former partner Kourtney Kardashian over his closeness to Kris.
Following clips of them taking exercise classes together, Kourtney questioned him: "Why are you hanging out with my mom?"
Kendall Jenner, 20, was filmed teaming up with will.i.am to star in the video for an updated version of Black Eyed Peas' 'Where is the Love', but she was warned by her brother Rob that she risked getting "a lot of hate" for endorcing the anti-gun violence campaign.
Later in the trailer, she was seen losing her temper over her family not taking her health concerns seriously.
She said: "I'm done arguing with people because I don't feel fine.
"I promise one day when I'm rushed to the hospital, then you guys are going to wake up."
Kim - who has children North, three, and Saint, 10 months, with husband Kanye West - previously opened up about assisting Caitlyn, 66, with her ESPYs look.
She said: "She wanted advice on what to wear. She gave me three days and said, 'Can you get me something?' I looked online. I shopped all over."
And the brunette beauty envies how her stepfather always looks good, but admitted finding something to suit her height was a challenge so she opted to secure a bespoke gown for Caitlyn instead.
She said: "I called Michael Costello. He was on Project Runway, so he has a studio in LA. So he whipped up five things in two seconds.
"I sent her measurements. And she wore this white number ... Really everything [looks good on her]. She's super slim. She definitely likes to be age appropriate. But then she'll like really short things. She seems to love clothes."
'Keeping Up With the Kardashians' returns on October 23.
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