'Jersey Shore' Star Mike 'The Situation' Sorrentino Penning Prison Tell-All

Mike "The Situation" Sorrentino has been keeping himself busy behind bars, as RadarOnline.com can exclusively reveal the Jersey Shore star is writing a shocking prison tell-all!

"Mike has been keeping an extensive diary, and has been writing about his experiences every day," a source close to Sorrentino, 36, said.

But Sorrentino — who is currently serving an eight-month prison sentence for tax evasion at FCI Otisville in New York — isn't penning the entire book himself.

"He is just taking notes in his diary for someone else to write it," the source dished exclusively to Radar.

However, despite the grim circumstances, the book won't be depressing or dark.

"Mike says he is being treated like a king in there and that he is actually having a good time."

"Mike can make a good situation out of anything. So it's not super shocking," the source explained of the star, who has been sober for over three years.

Likely helping his mood, the source claimed the entire cast of Jersey Shore has visited him behind bars, as well as his wife, Lauren Pesce, 34.

If Sorrentino keeps up his good behavior, he's expected to be released in September.