We didn't think that it could possibly get any worse for Britney Spears. But, we all know how that goes. Spears has been receiving threatening letters from an unidentified stalker. Apparently, the crazed "fan" mail has frightened the already troubled star to the point that she has called upon the FBI to investigate and protect her. Sources close to the singer say Spears was sent several death threats, a letter explaining how to make a bomb and even a shiny new sex toy. While Britney has reportedly requested an investigation by the federal agency, an FBI spokesperson announced that they "cannot comment on ongoing investigations."
