Caitlyn Jenner shares 'Secrets of My Life' in new memoir: 6 shocking revelations

Caitlyn Jenner has never shied away from the limelight, but she didn't always share everything about her life.

In her new memoir, The Secrets of My Life, Caitlyn goes in depth about living as Bruce Jenner, all the while knowing that she identified as a woman. She also drops some bombshells about her marriage to Kris Jenner and their famous family.

WATCH: Caitlyn Jenner Says She Hasn't Been on a Date in 2 Years -- 'I Have Never Been Approached'

Here are seven of the most shocking secrets the 67-year-old reality star spills in her new book:

1. Life as Bruce

In April 2015, Caitlyn -- who was still being called Bruce at the time -- revealed in an interview with ABC's Diane Sawyer that "for all intents and purposes, I am a woman."

Prior to this admission, the former Olympian continued to live life as a man and give motivational speeches, all the while hiding her true self from the world. "They don't know that underneath the business suit I am wearing panties and a bra," she writes. "That I am not Bruce Jenner but a woman I will come to call Caitlyn, who still has to be Bruce except for stolen moments where I can be my authentic self. The speech that I give is called 'Finding the Champion Within'. All bulls**t."

"I have [also] stolen makeup...not only from Kris but the rest of K-troop, because -- trust me on this -- there is more makeup per user in our home than any in history," Caitlyn continues. "I have bought makeup how-to-books. I keep the books, along with my meager collection of clothing, in a small closet with a lock in back of my own closet."

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Caitlyn Jenner
BEVERLY HILLS, CA - FEBRUARY 28: Caitlyn Jenner attends the 2016 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by Karwai Tang/WireImage)
NEW YORK, NY - FEBRUARY 11: Caitlyn Jenner attends Kanye West Yeezy Season 3 at Madison Square Garden on February 11, 2016 in New York City. (Photo by Kevin Mazur/Getty Images for Yeezy Season 3)
RANCHO PALOS VERDES, CA - FEBRUARY 02: Caitlyn Jenner attends AOL MAKERS Conference at Terranea Resort on February 2, 2016 in Rancho Palos Verdes, California. (Photo by Jerod Harris/WireImage)
RANCHO PALOS VERDES, CA - FEBRUARY 01: Caitlyn Jenner attends the AOL MAKERS Conference at Terranea Resort on February 1, 2016 in Rancho Palos Verdes, California. (Photo by Jerod Harris/WireImage)
PASADENA, CA - JANUARY 14: Tv personality Candis Cayne (L) and executive producer/tv personality Caitlyn Jenner speak onstage during the 'I Am Cait' panel discussion at the NBCUniversal portion of the 2016 Winter TCA Tour at Langham Hotel on January 14, 2016 in Pasadena, California. (Photo by Frederick M. Brown/Getty Images)
LOS ANGELES, CA - JANUARY 04: (Photo by Steve Granitz/WireImage)
NEW YORK, NY - NOVEMBER 10: Caitlyn Jenner attends the 2015 Victoria's Secret Fashion Show at Lexington Avenue Armory on November 10, 2015 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Victoria's Secret)
NEW YORK, NY - NOVEMBER 09: Caitlyn Jenner poses for a photo at the backstage inspiration wall at the 2015 Glamour Women of the Year Awards at Carnegie Hall on November 9, 2015 in New York City. (Photo by Nicholas Hunt/Getty Images for Glamour)
LOS ANGELES, CA - OCTOBER 27: Caitlyn Jenner attends Logo TV's 'Beautiful As I Want To Be' web series launch party at The Standard Hotel on October 27, 2015 in Los Angeles, California. (Photo by Tibrina Hobson/Getty Images)
PACIFIC PALISADES, CA - SEPTEMBER 12: Caitlyn Jenner attends the 8th Annual Safety Harbor Kids Polo Classic Fundraiser at Will Rogers State Historic Park on September 12, 2015 in Pacific Palisades, California. (Photo by Michael Bezjian/Getty Images)
LOS ANGELES, CA - JULY 15: (EXCLUSIVE COVERAGE) Caitlyn Jenner attends The 2015 ESPYS at Microsoft Theater on July 15, 2015 in Los Angeles, California. (Photo by Kevin Mazur/WireImage)
NEW YORK, NY - JUNE 30: Caitlyn Jenner is seen on June 30, 2015 in New York City. (Photo by NCP/Star Max/GC Images)
THE VIEW - Caitlyn Jenner guest co-hosts and Mischa Barton is the guest today, Friday, July 14, 2017 on ABC's 'The View.' 'The View' airs Monday-Friday (11:00 am-12:00 pm, ET) on the ABC Television Network. (Photo by Lorenzo Bevilaqua/ABC via Getty Images) CAITLYN JENNER
NEW YORK, NY - JULY 14: Caitlyn Jenner at The View on July 14, 2017 in New York City. (Photo by Jackson Lee/GC Images)
THE VIEW - Caitlyn Jenner guest co-hosts today, Thursday, July 13, 2017 on ABC's 'The View.' 'The View' airs Monday-Friday (11:00 am-12:00 pm, ET) on the ABC Television Network. (Photo by Heidi Gutman/ABC via Getty Images) CAITLYN JENNER, SARA HAINES
BEVERLY HILLS, CA - JUNE 18: Caitlyn Jenner displays her Austin-Healey Sprite and wins an award for 'most fashionable' car at The Rodeo Drive Concours d'Elegance on June 18, 2017 in Beverly Hills, California. (Photo by Tibrina Hobson/Getty Images)
LOS ANGELES, CA - JUNE 18: Caitlyn Jenner is seen on June 18, 2017 in Los Angeles, CA. (Photo by Hollywood To You/Star Max/GC Images)
BEVERLY HILLS, CA - JUNE 18: Caitlyn Jenner displays her Austin-Healey Sprite and wins an award for 'most fashionable' car at The Rodeo Drive Concours d'Elegance on June 18, 2017 in Beverly Hills, California. (Photo by Tibrina Hobson/Getty Images)
LONDON, UNITED KINGDOM - MAY 12: Caitlyn Jenner arrives at the British LGBT Awards on May 12, 2017 in London, England. PHOTOGRAPH BY Jules Annan / Barcroft Images London-T:+44 207 033 1031 - New York-T:+1 212 796 2458 - New Delhi-T:+91 11 4053 2429 (Photo credit should read Jules Annan / Barcroft Images / Barcroft Media via Getty Images)

WATCH: Kris Jenner vs. Caitlyn Jenner -- A Complete Timeline of the Breakdown of Their Relationship

2. Gender Reassignment Surgery

The I Am Cait star also shares that in January, she underwent reassignment surgery, nearly two years after announcing she was a transgender woman. "I just want to have all the right parts," Caitlyn explains in her book. "I'm also tired of tucking the damn thing in all the time."

"The surgery was a success, and I feel not only wonderful but liberated," she continues. "I am telling you you because I believe in candor. So all of you can stop staring. You want to know, so now you know. Which is why this is the first time, and the last time, I will ever speak of it."

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3. Dating Life

Caitlyn writes that she has no desire to ever be in a sexual relationship with a woman again. "Of the most important things in my life, sex is beyond the bottom; it has been that way for a long time," she notes. "A future female companion? Yes, I do think about that. A future female sex companion? Not happening, at least for now, and perhaps not ever."

She adds that while she's "never had the inclination" to have sex with men, she's not ruled out the idea. "Maybe that attitude might possibly change if I have the Final Surgery," Caitlyn explains, presumably writing this chapter prior to her reassignment surgery. "Maybe removing the last physical appendage of my maleness... will make me feel differently."

WATCH: Kris Jenner Says She's 'Done' With Caitlyn After Reading Her Memoir -- 'Everything She Says Is All Made Up'

4. The O.J. Simpson Trial

According to Caitlyn, Kris' first husband, attorney Robert Kardashian Sr., did not believe his friend, O.J. Simpson, was innocent in the murder of his wife, Nicole Brown Simpson and Ron Goldman, despite being part of his legal defense team. Caitlyn recalls being in a car with Robert in the late '90s, following O.J.'s initial acquittal and later conviction of manslaughter in a civil trial, and claims the lawyer told her, "I would've been okay with it if they had gotten him in the first trial."

"The implication was obvious that he believed O.J. was guilty," she adds.

Caitlyn also ponders if Robert defending O.J. was his way of getting revenge on Kris, who was good friends with Nicole. "I wonder if it was his way of saying to [Kris] what I think she was saying to him when she married me: a big f**k you," she writes.

While married to Kris, Caitlyn says she forbid her stepdaughters from saying O.J.'s name in the house.

WATCH: Khloe Kardashian Confronts Caitlyn Jenner, Admits She Misses Her 'Second Dad' Bruce

5. Sneaking Out

Caitlyn says there were times when she was living as Bruce that she would dress up as a woman and go out in public. She remembers that while staying at the Opryland Hotel in Nashville, Tennessee, that she decided to go see a movie by herself, dressed as a woman.

"I left the theater afterward and had to go to the bathroom. I doubt that for anyone else there it was a complex decision -- you have to go, so you go. For me it was, 'Oh my God, now what am I going to do?'" Caitlyn says. "I had actually used the women's room before during previous outings. Like everything else I had a particular routine: I would wait outside to make sure no one else was entering. That way I could go in by myself and use the stall farthest away from the door. If somebody came in I would wait until she left. Then I would get the hell out of there."

"The line for the women's room was lengthy that day. There was no way I was going to wait. So I scuttled back to the hotel as quickly as I could and made it up to my room," she continues. "I am still feeling good about myself when I get back. Nobody suspected anything. But I have an early flight tomorrow, which means Bruce will be back, rise and shine."

Style Throwback: Keeping Up With the Kardashians
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Style Throwback: Keeping Up With the Kardashians

Aww! The Jenners and Kardashians pose for a family portrait. 

Khloe, Kim, Bruce, Kris, Rob, and Kim attend a red carpet event together as a family. 
Kim, Khloe, and Kourtney look fierce on the red carpet. 
Gang's (almost) all here! Khloe, Bruce, Kim, Kris, Kourtney, and Rob attend the premiere of "Keeping Up With the Kardashians".
They got it from their mama! The girls and Kris step out in black at a red carpet event. 
10-year-old Kylie and 11-year-old Kendall look absolutely adorable at "Keeping Up With the Kardashians" viewing party. 
Bruce takes the girls out to Les Deux in Los Angeles for the Season 2 launch party. 
The girls arrive in all black at Bravo's A-List Awards. 
Kim goes for a blonde look at the Teen Choice Awards. 
Khloe's husband Lamar Odom strikes a pose with the ladies at the Teen Choice Awards. 
We spy coordinating leopard prints! Kris and the girls attend the Kardashian Kollection launch party in Hollywood. 
Khloe's dyed red locks stand out against her sisters' raven-colored hair at the People's Choice Awards. 
Sister sister! Kourtney and Kim hit the red carpet at an Oscars party. 
Kendall and Kylie are well on their way to becoming entrepreneurs like their mom and sisters -- the teens even have their own line at PacSun. 
Khloe and hubby NBA player Lamar Odom pose with little brother Rob at the E! upfronts. 
Kim and Kylie pose at the MTV Movie Awards. 
There's another Kardashian kid on the way! With Kim and boyfriend Kanye West as parents, there's no doubt this will be one stylish baby. 
Khloe Kardashian and rapper French Montana celebrate the reality TV star's birthday party in Las Vegas.
Kourtney Kardashian is spotted rocking all denim in NYC.
Kim and Kanye are spotted before their wedding in Paris, France.    
Kendall and Kylie Jenner attend the cover launch of DuJour Magazine in NYC exposing a whole lotta' midruff.    

EXCLUSIVE: Caitlyn Jenner's Relationship With Kardashian Children 'Not the Same,' Source Says

6. Married Life

Kris was Caitlyn's third wife and they were married from 1991 to 2015, and have two daughters, Kendall and Kylie Jenner. In the memoir, Caitlyn speaks about their love life while married. "Since -- let's not kid ourselves -- everyone wants to know, Kris and I had good and frequent sex at the beginning," she notes. "This will always be a subject of dispute between us. She insists that she was taken by surprise by my ultimate transition to Caitlyn, which obviously means in her mind that she did not know enough."

One year after Caitlyn came out about being a transgender woman in a televised interview, ET spoke with her about why she chose to address the public at that moment. "I really wanted it to not just be about me," she explained while backstage at the 2016 GLAAD Media Awards in New York City. "I wanted it about this community and about the struggles and the difficulties, and to help people understand what being gender dysphoric, transgender -- whatever you want to call it -- is."

WATCH: Caitlyn Jenner's Whirlwind 2 Years Since Coming Out as Transgender

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