Rapper Fat Joe, whose real name is Joseph Cartagena, turned himself in Monday to begin serving  a four-month prison sentence.

The 42-year-old emcee plead guilty in December after failing to pay income taxes in 2007 and 2008. The total income owed was more than  $1 million.

The “Lean Back” rapper is being held at the Federal Detention Center in Miami. According to TMZ, he will have to pay a $15,000 fine and serve an additional year under supervised release.