The Kardashians are "reeling" after an allegation that Khloe's baby-daddy cheated on her with Kylie Jenner's best friend, Jordyn Woods.
Ms Woods hasn't responded to the drama that has blown up online on Wednesday.
According to TMZ, Khloe put an end to her relationship with Tristan Thompson after learning of the cheating allegations.
A source close to the Kardashians says Kylie, who has called Jordyn her best friend for years, was in denial of the allegations for days.
E! News reported Kylie is "very torn on how to handle the situation".
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A source told the celebrity website that "Khloe is more disappointed that someone so close to their family would betray her".
According to their source, Tristan tried to deny the claims - but due to his past cheating allegations, Khloe "didn't believe him for a second."
"Khloe is reliving the worst kind of betrayal and pain all over again."
In an interview published two days ago by StyleCaster.com, Jordyn Woods said she knows "people are talking about me sometimes, so I like to wake up and see what they said."
"If something is worth addressing, I definitely would. But there hasn't been a reason to, luckily - knock on wood."
Replies to a tweet linking the interview acknowledge that it hasn't aged well.
"This just got funnier - talk about timing," one commenter says.