Caitlyn told host Piers Morgan.
She said that her reason for doing this was the fact that she did not trust the family enough and she didn't want the news to get leaked to the press.
"I didn't tell anybody", she said.
Caitlyn not only made a decision to let the Kardashians find out about her sex reassignment surgery when her book came out because she wanted to keep it completely private, but also because she didn't trust them to keep the information to themselves. 'I had already been living as Caitlyn for a year and a half, OK? "I told her before I ever slept with her, she knew".
Kim and Caitlyn haven't spoken for about a year, which she called "devastating" just two months ago.
Asked whether it was a huge relief to have transitioned, Caitlyn said: "Huge".
Piers said: "So you sent her the entire book?"
The rift between Caitlyn Jenner and the Kardashians has grown bigger and bigger ever since her memoir, Secrets of My Life, came out last April.
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Kim Kardashian accused her stepfather of giving her an abridged version of the book to approve before it was published, leaving out details of her recent surgery and accusations about her father Robert Kardashian.
Later in the clip, the star of the late I Am Cait admits she didn't want members of the family "to leak it to the press", as she "didn't trust them". "You just said, 'Certain areas?' That to a trans person is disrespectful". It is life. It is a very serious part of my life.
"You made a comment there and that's why you would get in trouble, OK?" People die over these issues.
Piers then concedes and ends the conversation with a simple, "Point taken".
The eye-opening interview took a left turn when Morgan pulled out a toy model of Caitlyn as a male track and field athlete and began quizzing her on the physical changes she has undertaken since her transition.
During her marriage to Kris Jenner, Caitlyn reportedly shied away from her biological children from previous marriages, which includes Brody Jenner, 34, and Brandon 36, from marriage to Linda Thompson and Burt, 39 and Cassandra, 37, from her marriage to Chrystie Jenner, in order to raise the Kardashian children as her own.
The family did reunite in November to celebrate the 22nd birthday of Kendall Jenner, Caitlyn and ex-wife Kris Jenner's oldest daughter together. Morgan asked. "Except for the last few pages when I talked about gender confirmation", Jenner said.