Mike "The Situation" Sorentino from Jersey Shore is in rehab.

Looks like the MTV star's hard-partying ways have gotten worse than ever during the taping of the most recent season of "Jersey Shore" ... and the signs were obvious during the episode when the gang went camping.  TMZ broke the story ... Sitch recently checked into rehab for substance abuse after realizing his recreational habits had spun out of control. Cast and crew members on "Jersey Shore" are happy he's getting help ... and hope that he will be healthy enough to join them for the recently announced Season 6.