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Kelis’ tax problems aren’t just restricted to New York — TMZ reported. The singer allegedly owes back taxes to the State of California AND the federal government.

As TMZ first reported, Kelis owes $330,426.71 in unpaid taxes in NY, stemming from the years 2004 and 2010.

But according to court docs obtained by TMZ, the “Milkshake” singer also owes $61,737.29 in taxes in California for the years 2009 and 2010 … and $213,932.02 to Uncle Sam for the same years.

All told, Kelis allegedly owes $606,096.12 in unpaid taxes.