Kris Jenner and estranged husband Bruce Jenner

Kris Jenner and estranged husband Bruce Jenner

Kris Jenner is "devastated" that Bruce Jenner is dating her former assistant.

The 'Keeping Up with the Kardashians' star, who split from the 64-year-old Olympic gold medallist last October after 22-years of marriage, is reportedly "completely heartbroken" that he is now romancing Ronda Kamihira, whom she has been friends with for 20 years.

A source close to the 58-year-old manager told PEOPLE.com: "Kris is devastated. This was her former assistant and best friend of 20 years."

The insider added: "She's so sad and completely heartbroken."

The former couple, who have daughters, Kendall, 18, and Kylie, 17, together as well as four other children each from previous marriages, including Kim Kardashian West, have spent a lot of time with Ronda's family over the past two decades.

The source said: "Kendall and Kylie grew up with her two kids and have been their best friends."

Kris - who recently filed for divorce from Bruce - "is just shocked," as she and Ronda also flew to Mexico with a group of female friends a few months ago.

Bruce and Ronda were spotted attending an Elton John concert in Los Angeles earlier this month.

Kris recently admitted she isn't ready to start dating yet, but hopes to fall in love again.

She said: "I want to definitely be in love, I like being in love, I think there's no better feeling in the world. So yeah, I mean that would be amazing."

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