Chrishell dropped the news on the "Selling Sunset" reunion special ... she and the nonbinary Australian singer are an item. She said, "I recently have been spending a lot of time with someone that's very important to me. Their name is G Flip. They're nonbinary, so they go by they/them. And, they're an extremely talented musician."

The 2 were seen leaving The Abbey in WeHo, spending 4 hours partying until 2 AM -- with plenty of PDA.

As for how they hooked up, Chrishell said, "It started because I was just going to be in their video. And, it's about this chaotic love story. I come from soaps, I love acting. And, with the job that we have, I don't always get to do it. At first of course I was like yes, let's do that."

The 27-year-old musician is reportedly living with Chrishell, 40, in her L.A. home. As we reported, Chrishell bought the home, in part, with the loot she got from selling her wedding ring courtesy of ex-hubby, Justin Hartley.

The 27-year-old musician hails from Melbourne and is known for their songs, "GAY 4 ME," "Lover," and "Drink Too Much."

Chrishell flew to Denver last weekend to watch her partner perform with Lauren Sanderson ... the 2 collabed on the song, "GAY 4 ME."