Jennifer Lopez and Sean C****s in 2000. Last updated: 8:17 am June 27, 2008 After nearly a decade of keeping mum, J.Lo will be forced to testify in a lawsuit over a 1999 nightclub shooting involving her ex-boyfriend Sean "Diddy" C****s. Jennifer Lopez last week was served with a subpoena informing her she will be asked to tell all she knows at an upcoming deposition. The subpoena came from lawyers for Natania Reuben, a woman who was shot in the face during the melee and has lobbed a $130 million lawsuit against C****s and jailed Jamal "Shyne" Barrow. Lopez, who was with C****s at the now-defunct Club New York on the night of the Dec. 27, 1999, shooting, was not called as a witness at the criminal trial of her ex-boyfriend and Shyne and has never publicly recounted what she saw