Miley Cyrus -- Makin' Out with Hot New Chick (PHOTO/VIDEO)

Miley Cyrus has bagged herself a Victoria's Secret model ... and during a break from filming a new music video Tuesday night in Los Angeles ... they locked up in a heavy make-out session.

The girl's Stella Maxwell, and she and Miley have been hanging out quite a bit lately. Miley posted a photo with Stella a few weeks back and captioned it,

IT STARTED WITH A KISS

The photo and video were shot Tuesday night in a parking lot in Hollywood. They both saw the cameras and clearly kissed to make a point, and it did not seem like a typical Miley gag.

We had to blur the video because Miley's hand goes south with Stella's help.

Miley has said recently she's bisexual.