Swizz Beatz has again been hit by the tax man. According to public records, the fiancé of Alicia Keys -- who's pregnant with Beatz's child -- was slapped with an IRS lien of $652,727 on June 3 for unpaid 2008 income tax. The music producer, real name Kasseem Dean, has had a string of liens filed against him and his former wife, Mashonda, in New York, Georgia and California. Their debts stand at about $2.2 million. A lawyer for Beatz said, "We have been discussing the issue with the government for years and are currently negotiating an amicable resolution of the dispute."