Kardashian died at age 59 in 2003 after he was diagnosed with esophageal cancer
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Kris Jenner admitted the "biggest mistake" in her life was being unfaithful to her ex-husband.
The reality star candidly spoke out about her infidelity that occurred while she was married to her Robert Kardashian, Sr. for 12 years.
"What was your mindset when you cheated?" Khloe Kardashian asked her mother on Thursday's episode of "The Kardashians" on Hulu.
Kris Jenner confessed cheating on ex-husband Robert Kardashian was "life's biggest regret." (Getty Images)
"When you did that with my dad, and you had four kids and you had a family? … Yes, I know you were really young...."
Jenner was at first startled by the question, but then replied, "…being really young and dumb is something that plays into it because you don’t really understand the consequences of your actions."
Kardashian dug into the conversation deeper and asked, "But what was my dad not doing that made you want to look elsewhere."
Kris Jenner was married to Robert Kardashian Sr. from July 1978 until March 1991. The couple had four children together: Kourtney, Kim, Khloe and Robert Jr. Kardashian. (Jon Kopaloff)
The mom-of-six confessed, "I don't know because he was such a great husband and such a great dad… I think that I fell into a situation where I thought that the grass was greener somewhere else, and I made a huge mistake. That’s my life’s biggest regret."
Jenner was married to Kardashian Sr. from July 1978 until March 1991. The couple had four children together: Kourtney, Kim, Khloe and Robert Kardashian Jr.
Kris Jenner found love again after her marriage to Robert Kardashian Sr. (Photo by Araya Doheny/Getty Images)
The businesswoman and "mom-ager" then married Caitlyn Jenner and the pair welcomed two children -- Kylie and Kendall Jenner. They announced their separation in October 2013.
Caitlyn Jenner welcomed two children with Kris Jenner before they separated in 2013. (Phillip Faraone/WireImage)
Jenner continued to open up about her marriage with her ex-husband Robert Kardashian Sr.
"I’m not proud of the way I behaved during that time… Everything happens for a reason. I really do live my life by thinking God has a plan and without that whole thing happening there never would’ve been Kendall and Kylie," Jenner pointed out.
This May 1995 file photo shows murder defendant O.J. Simpson, right, consulting with friend Robert Kardashian and Alvin Michelson, left, during a hearing in Los Angeles. (Getty Images)
Kardashian died at age 59 on Sept. 30, 2003, less than eight weeks after he was diagnosed with esophageal cancer. He was lauded as a stout member of O.J. Simpson’s legal defense "dream team" after the former football star was charged with murdering his ex-wife Nicole Brown and her friend Ron Goldman in June 1994. Simpson was acquitted after what many still consider the "trial of the century."
Murder defendant O.J. Simpson, right, listens to testimony by the Los Angeles County Coroner. Robert Kardashian sits next to him. (Getty Images)
Kris Jenner is currently dating Corey Gamble, 42, and the couple have been public with their relationship since 2015, shortly after she divorced Caitlyn Jenner. Gamble was previously Justin Bieber's tour manager.
The conversation about Kris cheating on her ex-husband was brought up as Khloe sought advice on her own tumultuous relationship.
KHLOE KARDASHIAN WAS SECRETLY ENGAGED TO TRISTAN THOMPSON WHEN HE GOT ANOTHER WOMAN PREGNANT: REPORT
The 39-year-old was previously in a relationship with NBA star Tristan Thompson before she discovered he had fathered a child with Marlee Nichols while the pair were engaged.
Both Thompson and Kardashian share two young children – True, 5, and a son, who they welcomed via surrogate last August.
Stephanie Giang-Paunon is an Entertainment Writer for Fox News Digital. Story tips can be sent to
