Cameron Diaz got tongues wagging when she departed Nobu in West Hollywood Wednesday night with a mystery man at the wheel.

But her driver wasn't a date at all it was actually her agent, Nick Stein. In fact, her boy-toy, model Paul Sculfor, rounded out this threesome for sushi.

Cam and Paul have been on a string of dates, and even kissed for the cameras Sunday while shopping.

Also interesting about last night: the ring Diaz was rockin' on her left hand.

It's way too soon for an engagement ring, but it's never too soon to get all the tabloids talking.

Someone give their publicists a raise already.