Kendall Jenner. Picture: Alastair Grant/AP

Kendall Jenner thinks Caitlyn Jenner’s memoir is “insane”.

The 67-year-old reality star – who was formerly known as Bruce Jenner before undergoing gender reassignment – recently released her memoir ‘Secrets of My Life’ in which she details her relationship with ex-wife Kris Jenner, whom she divorced from in 2014 and with whom she had two daughters, Kendall, 21, and Kylie, 19.

Now, in a preview clip for an upcoming episode of ‘Keeping Up with the Kardashians’, Kendall can be heard telling her 61-year-old mother the contents of the book is “insane”.

In one clip, Kendall asks her half-sister Kim Kardashian West: “You read the whole thing? What did she say?”

The camera then cuts to the model sat in the kitchen with Kris, where she says: “It’s insane mum! That’s insane!”

Kendall’s shock at the contents of the memoir comes after Kim, 36, recently blasted her former step-father for including details of her relationship with Kris in her book, as she believes Caitlyn is wrong to “bash other people” in her writing.

Kim said previously: "That was my stepdad for so many years. She taught me about character and so much growing up, and I just feel like I don't respect the character that she's showing now ... like there's no need for a book. Tell your story, but just don't bash other people I just think it's not tasteful.”

The brunette beauty also said her "heart breaks" for her mother Kris, who has to hear all these "untruthful" things.

She added: "My heart breaks for my mum because I feel like she's been through so much. Caitlyn's promoting this book and she's saying all these things. And I just don't think it's necessary. I just feel like it's unfair, things aren't truthful.

"I feel like it's taken her a really long time to be honest with herself, so I don't expect her to be honest about my mom now ... But it's just so hurtful. I wish her all the success in the world, but not at our expense."

Bang Showbiz