Just when you think you have a good nice clean celebrity that's in the spotlight, they've got to come out and say they've got an addiction. Unfortunately the stress often associated with a high profile job probably leads a lot of celebrities to use drugs to numb the craziness.
Besides at that level - no one loves you for you - they just like the way you look, your money, or your accomplishments, but never your personality, never your quirks, never the real person that comes out when the cameras and lights are off. Often this is the real person that just a handful of people surrounding the celebrity get to see.
Its really sad when your manager becomes your one and only friend on the road.