Fat Joe turned himself in to prison Monday to begin his four-month sentence for tax evasion, TMZ.com reports.
The "What's Luv?" rapper, whose real name is Joseph Cartagena, is officially in custody at the Federal Detention Center in Miami.
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Fat Joe pled guilty in December to failing to pay more than $1 million in taxes for the years of 2007 and 2008.
Although he originally faced up to a maximum of two years behind bars, he was ultimately sentenced to four months and a $15,000 fine, plus one-year supervised release.