Kim Kardashian and Brandon Jenner apparently kissed "back in the day." Credit: Richard Bord/Getty Images; David Livingston/Getty Images

All in the family? In the latest episode of Keeping Up With the Kardashians, which aired on Sunday, July 27, Brody Jenner revealed that his brother Brandon Jenner and their stepsister Kim Kardashian once got a little too close for comfort. 

Brody, 30, was getting heat from his family members for joking about being turned on after walking in on Kardashian, 33, staging a sexy photo shoot in a barely there outfit for her husband Kanye West

"I feel like Brody is crushing on Kim," Kris Jenner teased. "I think you've had a crush since you were 7 years old." Kris married Brody's dad, Bruce Jenner, in 1991. 

Brody, in turn, denied he ever had feelings for his stepsister—and then turned that attention on his brother Brandon. "That was him and Kim!" Brody shot back, pointing at Brandon, 33. "You're forgetting that. They kissed back in the day."

As Brandon tried to deny the incident with an embarrassed look on his face, Brody continued, "It's on you now! And he knows it's true."

While Brandon gave no further confirmation or details on the alleged Clueless-esque moment, he quickly changed the subject in an attempt to deflect the attention.