Justin Bieber may not be dating Kendall Jenner, but that doesn't mean he can't pretend to be for a sexy photo shoot!

While the Biebs is rumored to be hooking up with Kendall's good friend Hailey Baldwin, it was the raven-haired Jenner who was the focus of Justin's attention Saturday at a photo shoot outside a mansion in the Hollywood Hills.

On hand to keep an eye on things were Kris Jenner and, conveniently, Justin's handler Corey Gamble ... who happens to be sleeping with Kris! Ahhh, the tight circles these people run in ... (I could say more about tight and not-so-tight circles, but I won't.)

From our eye-in-the-sky perspective, we saw the cute couple get cozy for the cameras and spend down-time laughing and joking around -- oh, we're talking about Justin and Kendall, here. That said, Kris was flirty and fresh with Corey -- their romance isn't just for the cameras, it's the real deal!