Nicole Richie means business. Stay away from her kids. In a sharply worded letter sent to paparazzi photo agency X17, the mom of two makes it clear that she is not happy photographers park themselves outside of daughter Harlow's school daily. On her blog today she writes: You are stalking the children. Now how do you feel? I PROMISE YOU that I am going to do a background check on each and every person that I see there. For the safety of my children and others. Because the last time I did a check on your staff, I found they had no.....