Pop diva Jennifer Lopez proudly sings how she is 'Jenny from the Block' but a new UK Television Documentary brings the story tumbling down.It reveals that she comes from a smart (posh) New York suburb, had a private education and experienced nothing of the tough urban upbringing she likes to protray to her admiring fans.In it J-Lo--who just bought a 10 million dollar island hideaway with fiancee Ben Affleck-sang about the girl who 'used to have a little and now has a lot.' Photographer Tony Duran says: 'I remember the first day I met her,. She told me, 'If you...