Bruce Jenner has rebounded from his estranged wife Kris Jenner with her former assistant and best friend Ronda Kamihira.

Bruce Dating Kris Jenner's Best Friend

Bruce, 64, and Kamihira have embarked on a romantic relationship together in recent months. "Kris is devastated," the source told People magazine. "This was her former assistant and best friend of 20 years."

"Kendall and Kylie grew up with her two kids and have been their best friends,” the sourced added.

Earlier this month, Kris admitted that the thought of dating was still daunting. “That's the $60 million question," Jenner said. "I don't know. I don't know yet. It's [daunting]."

Now that Bruce has moved on – with her best friend no less – Kris has apparently been taken by surprise. She "is just shocked,” according to an insider. “She's so sad and completely heartbroken.

Kris and Bruce had been married for 22 years in which they welcomed Kendall and Kylie and raised Kourtney, Kim, Khloe and Rob.