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...