Miley Cyrus -- New Girl/Girl Relationship ... Passion or PR Stunt?

Miley Cyrus' make out session with Victoria's Secret model Stella Maxwell was intense, but there's some evidence this might have been brilliant guerrilla marketing.

The kissing pics were snapped Tuesday night during a break from the set of a music video for Mike Will's song, "Drinks On Us." It appears they're both in the video, so staging the scene would be brilliant marketing. The video should be big -- it features Mike Will, Future, French Montana and Rae Sremmurd.

As for the "it could be real" side ... according to our sources, Miley and Stella have been hanging since Miley and Patrick Schwarzenegger called it quits back in April. The two have been pictured together quite often, and some of the photos seem very couple-y.

Stella even hit up a Miley concert recently and posted a video of herself singing along to one of Miley's songs ... and the lyrics were of the XXX variety.

Stella also has a history with male celebs, but she's also been linked to a Victoria Secret model.

So we gotta ask ...