Vanessa Minnillo was behaving bizarrely last night at Coco De Ville with a mystery man!

At first she seemed impatient to leave while her companion was chatting up a pal, then she freaked out and ran into the car when she saw the cameras. But then when her guy didn't take her toe-tapping cue to leave, she strode back into the club, in full view of the photogs!

So which is it? Is she hiding this guy from Nick or trying to make him jealous?