Celebrity battles with addiction and vice are nothing new. You can't turn on the TV or browse the net without turning up a story about what kind of trouble young actresses are getting themselves into. Some stars are addicted to plastic surgery, or drugs, or have a little touch of the kleptomania. Others are habitual horndogs. Shows like Celebrity Rehab wouldn't exist if addiction didn't run rampant in Hollywood. Well, there's another addiction on the list of dangers celebs face, and it's The Hills.