Khloé Kardashian reveals how Kim and Kourtney's infamous fight wound up on 'KUWTK' after someone from E! saw it happen on-set

• An E! representative was on-set when Kim and Kourtney Kardashian had their infamous physical fight.
• "My mom wasn't there and Kendall and I were, kind of, just in shock," Khloé Kardashian said.
• Kris Jenner admitted that she wanted to edit the fight out, but the family decided to leave it in.

Khloé Kardashian revealed during part one of the "Keeping Up With The Kardashians" reunion special that Kim and Kourtney Kardashian's infamous physical fight on the long-running show made it to air partially because a representative from E! (the network where the show aired for 14 years) watched it happen in real life.

In one of the more heated moments from the long-running reality series that wrapped its 20th, and final, season on June 10, the two oldest Kardashian sisters are seen punching and hitting each other after Kim criticizes Kourtney's work ethic. Khloé tries to unsuccessfully break up the fight while Kendall laughs in the background.

During the first part of the wide-ranging reunion interview with TV host Andy Cohen on Thursday, Khloé opened up about the emotionally-charged season 18 "KUWTK" moment involving her older sisters. Kim and Kourtney, along with Kendall, Kylie, and Kris Jenner, were also present during the special, which took a closer look back at the Kardashian-Jenner family's reality show.

"One day, out of all of filming, we have an E! representative come to set," Khloé said about filming the controversial scene that aired in March 2020. "And that day, an E! representative was on-set during the fight."

"My mom wasn't there and Kendall and I were, kind of, just in shock," she continued, while Kendall added that everyone else initially thought Kim and Kourtney were "joking" when the two Kardashian sisters started fighting.

Khloé added: "So, [Kim and Kourtney] didn't want it shown but also, an E! rep is there ..."

"And [people at the network] know it happened," Cohen chimed in, with Khloé repeating Cohen's remark and agreeing with it.

Kris also admitted that she initially wanted to edit out the contentious scene between Kim and Kourtney from the "KUWTK" episode, but ultimately, the Kardashian-Jenner family made a collective decision to leave it in and have it air.

It wasn't the sisters' first fight on "KUWTK," but it was the first one where Kim and Kourtney got physical.

In 2018, Kim famously called Kourtney "the least exciting to look at" in an episode after the sisters couldn't agree on a time to shoot the family's annual Christmas card.

"I need Kourtney to not be so f--king annoying with a stick up her a-- like she runs this s--- because she doesn't," Kim was filmed telling Kris Jenner about her older sister. "She is the least exciting to look at, so she can be out."

A few months after Kim and Kourtney's fight aired in 2020, Kourtney announced in July that she was taking a break from filming the reality show, citing a "toxic environment." Kris announced in September that "KUWTK" was ending.

Kourtney echoed her sentiments about the show during Thursday's chat with Cohen, stating that "KUWTK" had become a "slightly toxic environment" towards the end of its run.

She added that she was "there for it for a long time" when it came to sharing her life and relationships on-camera but it no longer felt "productive" to her to do the show.

"The time that it was taking to film, and the turnaround," Kourtney said, detailing one of her complaints about the reality show. "And that it was like six months later, the episode would air."