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Like most of the ‘Jersey Shore’ crew,  Mike Sorrentino a.k.a ‘The Situation’ has been on a non-stop party train since the show debuted on MTV 2 years ago -- drinking and making paid appearances at nightclubs all over the world. Well, it finally got out of control!

TMZ broke the story that Sitch finally checked into rehab for substance abuse after realizing his recreational habits had spun out of control.

Sources close to Sitch have noticed the reality star had been showing signs of substance abuse for a while ... but it was obvious "he was getting worse" as the season went on. Several people noticed he was "acting paranoid" on the set ... and the unusual behavior was evident in certain Season 5 episodes that recently aired on MTV. The signs were especially obvious during the episode when the gang went camping. Sitch can be seen acting jittery, sweating profusely and just acting really bizarre.

A rep for the Situation just contacted TMZ to say they are not confirming that Mike is in rehab ... just that he "has spent the past several weeks at an undisclosed location for much needed rest and recuperation after his extensive production and appearance schedule."

 MTV just announced "Jersey Shore" is returning for a 6th season ,which is scheduled to start shooting this summer. Sources say the 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.

Looks like it's time to put the abs and the vodka away. As the saying goes, "It's all fun and games until a Guido goes to rehab." Right?