Katt Williams can add one more to his long list of problems. The troublemaking comedian has been slapped with a $4 million bill for unpaid taxes by the Internal Revenue Service, TMZ reports. 
Uncle Sam has filed a tax lien against Williams, claiming he owes $3.2 million in back taxes from 2008 and another $800,000 or so from 2009. This is the second lien filed against the arrest-prone comedian by the tax authorities. The first one was for $284,000 in 2010. 

Williams is facing a whole host of legal issues stemming from various arrests and assault charges. Most recently, he was accused of physically assaulting a woman at an Oakland bar. 
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