He's certainly got a type!

Bruce Jenner is dating estranged wife Kris' longtime pal Ronda Kamihira, People reports. "Kris is devastated. This was her former assistant and best friend of 20 years," a source dished the mag. "Kendall and Kylie grew up with her two kids and have been their best friends," the source added.

The new couple was first spotted together at an Elton John concert in L.A. earlier this month, leading to the speculation that the former Olympian had finally moved on. The Kardashian family matriarch is apparently "shocked" and isn't handling the betrayal particularly well. "She's so sad and completely heartbroken," the source revealed.

You never know what you've got till it's gone!