Kris Jenner ‘In Shock’ After Learning Ex-Husband Bruce Jenner Dating Her BFF

Bruce Jenner has tongues wagging – and for once it isn’t because of his looks!

The reality dad, who has been going through a very public transformation in appearance, has begun dating Ronda Kamihira, his ex-wife Kris Jenner’s longtime confidant.

"Kris is devastated," a source tells People. "This was her former assistant and best friend of 20 years."

Bruce, 64, raised eyebrows when he was first spotted with Kamihira at an Oct. 4 Elton John concert in Los Angeles.

News of the relationship has been hard for the Jenner-Kardashian clan to swallow. Kamihira — who recently went away with Kris on vacation to Punta Mita, Mexico — had been a continuous presence in the lives of the Jenners’ two daughters.

"Kendall and Kylie grew up with her two kids and have been their best friends," notes the source, adding that Kris “is shocked…sad and completely heartbroken” by the news.

As RadarOnline.com reported, Kris, 58, was already reeling from the end of her 22-year marriage to Bruce after they both filed for divorce last month.

“I feel like I failed at something, because I wanted it to be that relationship for the rest of my life,” she said. “I signed up at the time for happily ever after and it didn’t work out that way.”