Kim and Kourtney Kardashian reveal their feelings about their mom's extramarital affair on Sunday night's episode of "Keeping Up With The Kardashians."

In the preview clip above, the sisters discuss their mom's decision to write about cheating on then-husband Robert Kardashian in her recent memoir.

"I've definitely talked to my mom about her affair," Kourtney says to to the camera. "I'm not saying that my mom was being selfish on purpose but I think her actions were definitely selfish."

Kris Jenner divorced Robert Kardashian in 1991 after 12 years of marriage and four children together. In her memoir, “Kris Jenner and All Things Kardashian,” the reality martriach opens up about why she strayed in her marriage. Robert "had been the only man in my life since I was 18... I don't know why I was having a mid-life crisis at 30, but I was,” she writes.

Jenner married former Olympian Bruce Jenner in 1991. The pair have two daughters together.

Watch the video above to hear what else the Kardashian sisters had to say about their mom. Then click through the slideshow below to see what other celebs have said about their parents' divorces.

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  • Nicole Richie

    In a 2004 <a href="" target="_hplink">interview with Oprah</a>, Nicole Richie revealed how her dad Lionel Ritchie's <a href="" target="_hplink">1993 divorce</a> from her mother, Brenda, affected her at eight years old: "When my dad divorced my mom it was kind of like him leaving me also."

  • Christina Hendricks

    In the March 2012 issue of <em>Cosmopolitan UK</em>, Christina <a href="" target="_hplink">Hendricks opened up about her parents' split</a>. The "Mad Men" star told the magazine that their divorce -- which happened just after she graduated from high school -- "didn't affect" her. "They hadn't been getting along for some time," she said. "I was like, 'Just get a divorce. Save yourselves.'"

  • Justin Bieber

    During a 2010 concert, <a href="" target="_hplink">Justin Bieber reportedly broke down</a> after performing "Down to Earth," a song inspired by his parent's split, which <a href="" target="_hplink">happened when the pop star was three</a>. "My parents splitting up is definitely not one of the highlights of my life. It's sad, the kid experiences feeling like one of his parents left," <a href="" target="_hplink">Bieber reportedly</a> told <a href="" target="_hplink"><em>Twist</em> magazine</a> in June 2010. "It makes you not feel so good. I think a lot of kids have had their parents split up, and they should know that it wasn't because of something they did."

  • Khloe Kardashian

    In an April 2011 <a href="" target="_hplink"><em>Us Weekly</em> interview,</a> Khloe Kardashian opened up about gaining weight after her parents' 1991 divorce: "My brother [Rob] and I were always heavy. They gave us food to keep us comforted. All we did was eat crap."

  • Britney Spears

    In August 2002, <a href=",3285883&dq=britney-spears+parent's+divorce&hl=en" target="_hplink">Britney Spears had this to say</a> about her parent's divorce that year: "It's the best thing that's ever happened to my family."

  • Johnny Depp

    Johnny Depp recently opened up about the response he had to his parents divorce as teen. According to the <a href="" target="_hplink"><em>Daily Mail</em></a>, the actor said, "I recall hearing my parents argue and thinking: 'Come on, this is torture. Just split!' They stuck it out until I was 15, but I'd seen it coming for years. When they finally did divorce, I thought: 'OK, this is the right thing'."

  • Pink

    In a <a href=",,,00.html" target="_hplink">2007 interview with the <em>Sunday Telegraph</em></a>, singer Pink said she morphed into an angry teen following her parent's divorce. "I was never allowed to go over to any of my friends' houses when I was little, because I was the bad influence," she said. "None of their parents liked me and my own parents were scared to death of me -- and for me."

  • Justin Timberlake

    In the August 2011 issue of <em>Elle</em>, Justin Timberlake <a href="" target="_hplink">talked about the impact his parent's divorce</a> had on him. "My parents divorced when I was three. I'm humbly and honestly finding out that I have a lot of issues with that," Timberlake told the magazine. "I'm finding more and more that... I'm going to break the chain because that's what you want to do, break the chain of your parents. But at some point, it's in your blood and you have a thing that happens and you're like, 'Holy s**t, my parents did that.'"

  • Brooke Hogan

    In 2008, <a href="" target="_hplink">Brooke Hogan opened up about the closure</a> she felt after parents, Hulk and Linda Hogan, <a href="" target="_hplink">divorced</a>. "I was relieved to hear that the divorce was finally signed, sealed and delivered," she said. "They weren't good together. ... So it's like OK, everything's over, everything's done, you guys don't have to hate each other anymore."

  • Carrie Fisher

    In <a href="" target="_hplink">a statement released after Elizabeth Taylor's death</a>, Carrie Fisher got sentimental about her father's decision to leave her mother, Debbie Reynolds, for Taylor. "If my father had to divorce my mother for anyone -- I'm so grateful that it was Elizabeth," Fisher said.

  • Bette Davis

    Film legend <a href="" target="_hplink">Bette Davis allegedly had this to say</a> about her parent's divorce, which <a href=""bette+davis"&hl=en&sa=X&ei=WuCyT7fSIeSJiAKXp5CkBA&ved=0CEAQ6AEwAQ#v=onepage&q=parents divorce 7 "bette davis"&f=false" target="_hplink">occured when she was seven years old</a>: "Of course I replaced my father. I became my own father and everyone else's."