LOS ANGELES (TheWrap.com) – What's Jennifer Lopez's reputation worth? About $20 million, according to a lawsuit filed Friday by the singer/actress and former "American Idol" judge. Lopez filed suit against her former driver and head of security, Hakob Manoukian, in Los Angeles Superior Court on Friday, saying that he tried to blackmail her by threatening to reveal damaging information he'd obtained about her during his time of employment with Lopez. According to the suit, Manoukian worked for Lopez for about a month before quitting due to a dispute with her management team. …