Aside from now knowing how to blackmail, Kevin Federline has learned to write — on shower doors and scratch paper. After his November 8th “performance” at the House of Blues in Chicago, and the day after Britney Spears filed for divorce, he left a little love note for his soon to be ex-wife. Sounds like somebody has been eating sour grapes. According to US Weekly, the note was really written by him, as the signature matches a poster...