REUTERS/Mike SegarBillionaire John Paulson, who is already locked in a bitter divorce fight with his estranged wife, has a new legal fight on his hands: He’s suing a former business partner for allegedly defrauding him out of almost $200 million.Paulson is a hedge fund manager famous for shorting the housing market in 2007. More recently, he’s been a fixture in the gossip pages for his ugly breakup with his wife and his romance with a much younger dietician.In a federal complaint, Paulson claims