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Bruce Jenner is rebounding from his separation with Kris Jenner quite nicely. He's apparently already dating.

People magazine is reporting that the former Olympian has begun a new romance with his ex-wife's longtime friend and former assistant, Ronda Kamihira.

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

The potential new romance comes a month after the reality TV mom and dad filed for divorce, ending their 22-year marriage. The couple maintained the split was absolutely amicable.

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Kris "is just shocked" that Bruce has moved on with her friend, the magazine said. "She's so sad and completely heartbroken."

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Bruce first publicly stepped out with Ronda in L.A. at an Elton John concert on Oct. 4, where he sported his longer hair. And just months earlier, Bruce's new love joined Kris for a getaway to Punta Mita, Mexico. Ronda, however, was not seen with Bruce and members of the family during a brief getaway to Las Vegas last weekend.