Brody Jenner Reveals Kim Kardashian Kissed Her Stepbrother

— -- On Sunday's "Keeping Up with the Kardashians," Brody Jenner claimed that Kim Kardashian once kissed her stepbrother, Brandon Jenner.

The topic came up While Brody Jenner, 30, was talking about being grossed out by walking in on his sister while she was taking sexy selfies.

First, Kris Jenner told Brody Jenner that Kim Kardashian was working on a selfie book -- but that's a story for a different day.

Read: Brody Jenner Gives the Real Reason Why He Missed Kim Kardashian's Wedding

"I feel like Brody is crushing on Kim," Kris Jenner joked.

But Brody Jenner made sure to call out his big brother, Brandon, 33, about his past interaction with Kardashian.

"That was [Brandon] and Kim, you are forgetting that," Brody Jenner. "They kissed back in the day!"

Kris Jenner couldn't help but say, "What!? ... Oh my God."

Brandon Jenner turned a little red and hung his head, but mumbled, "It's not true."

Then Brandon Jenner changed the topic to the beauty of the islands they were going to vacation on.