Tina Brown (R) signs copies of her book "The Diana Chronicles" as she is watched by Conservative MP Boris Johnson (C) at a launch party hosted by Reuters in the Serpentine Gallery in central London, June 18, 2007. The former queen of celebrity journalism, Brown, says there is no mystery to the death of Princess Diana even though many people, including one of her sons, still question what happened on that night in Paris 10 years ago. REUTERS/Paul Hackett (BRITAIN)