The Situation -- No Drinks for Him!

The cast of "Jersey Shore" hit up a bar last night in their first outing of the new season, and while the recently rehabbed Mike "The Situation" Sorrentino was there ... he didn't touch any alcohol ... TMZ has learned.

The Situation has publicly said that he was not in rehab for alcohol -- but as TMZ first reported ... his trip to Cirque Lodge was indeed for both prescription pills and alcohol.

Now get this ... not only did The Situation (and a pregnant Snooki) abstain from alcohol, it appears the entire cast did as well, in an apparent showing of solidarity.

It's a huge contrast from prior seasons, and especially interesting given that the bar is the same place where a drunken Snooki got knocked out by a fierce punch. The cast was actually sitting outside the bar on a patio.