Heidi Klum has been keeping a low profile ever since her ex-husband Seal claimed she was having an affair during their marriage. Now she speaks out completely, and she reveals how she is in a relationship with her family's bodyguard, Martin Kristen: "It just started", she said smiling. "I've known him for four years and he's been with our family for the last four years. He's cared for, our entire family mostly for our four children, helped ...