Fat Joe now in detention

Fat Joe has just turned himself in to prison to serve his 4 month sentence for tax evasion.

Joseph Cartagena that's Fat joe is officially in custody at the Federal Detention Center in Miami.

Joe pled guilty back in December on a boatload of taxes for the years 2007 and 2008 ... more than $1 million total.

He originally faced up to two years in the slammer for the crime -- but was ultimately sentenced to just 4 months and a $15,000 fine, plus one-year supervised release.



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