Lauryn Hill is in serious trouble with the Internal Revenue Service. In charges filed in a New Jersey Federal Court, the former Fugees singer is accused of not paying taxes in the years 2005, 2006 and 2007. According to a report by TMZ, Hill earned more than$1.8 million during those years.   If found guilty of the charges Hill could face up to three years in prison and a $300,000fine.   She…