The husband of superstar Jennifer Lopez may owe millions of dollars in unpaid taxes, RadarOnline.com has exclusively learned.

DOCUMENTS: See Marc Anthony's Tax Lien

New York authorities filed a demand for $1.8 million in back taxes against Marc Anthony on March 29, 2010 in Nassau County, Long Island. Just three months earlier, a federal tax lien for $1.6 million was placed on the same property owned by the I Need To Know singer.

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It's unclear if Anthony has settled the debt and requests for comment from his lawyer and manager were not returned.