Britney Spears and husband Kevin Federline have been plagued by a series of chilling death threats since marrying last month. The Toxic star, 22, and her dancer spouse have become the victims of a barrage of "hate mail" from unhappy fans who disagree with the union. And the venomous letters have reportedly encouraged Federline to take tuition in how to use a handgun for personal safety reasons from his wife's bodyguards, according to the News of the World. A source says: "Britney's used to the hate mail but recently Kevin has wanted to increase security." Thanks vbssite.tk.