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Has Mike 'The Situation' quit 'Jersey Shore'?

MTV has quite a situation on their hands.

Days after Vinny Guadagnino stopped filming "Jersey Shore's" fifth season, an insider tells Us Weekly thatMike "The Situation" Sorrentino has decided to follow in his costar's footsteps and head home early.

"Mike walked off the show. He's so over the whole thing," the insider says of the 29-year-old reality star. "I don't think he's coming back. Everyone in the house is so unhappy."

The rest of the cast — which includes Nicole "Snooki" Polizzi, Ronnie Ortiz-Magro, Sammi"Sweeatheart" Giancola, Paul "DJ Pauly D" DelVecchio and DeenaCortese — recently returned to Seaside Heights, NJ, to begin work on the fifth season.

"Jersey Shore's" Italy-set episodes premiere August 4 at 10 p.m. (EST) on MTV.