French Montana & Ashley Graham All Smiles After Dinner Date

French Montana and Ashley Graham left a lot to the imagination when they walked out of dinner in NYC Wednesday night.

We saw the rapper and S.I. cover girl leaving Philippe Chow ... with a crew, so we're guessing it wasn't a romantic date, and probably just biz. Plus, Ashley's married.

Check out the video ... our photog tried to get some details out of them, but they're playing it coy. Best guess -- look for Ashley's bod in a French music vid soon.