Yo-Yo diets: Which celebs are the worst offenders?

You know that we love to gawk at fit celebs -- but we also love to gawk at the non-fit ones. You know, the ones who stumble from scary skinny to curvaceous and all the way back again. Our friends over at AOL Health recently compiled a list of celebs who are guilty of riding the yo-yo rollercoaster of weight loss. Here are some of the top offenders:

• Nicole Ritchie. In The Simple Life, she was sweet. Prior to daughter Harlow's birth, she was skeletal. Now she's somewhere in between -- let's hope she stays that way.
  
• Matthew Perry. Yes, it was all down to drugs, but that didn't stop Perry's alarming weight loss to raise a few eyebrows.
  
• Christian Bale. Already-slim Bale reportedly lost 63 pounds to play a heroin addict. Yikes - that cannot be healthy.
  
• Beyonce Knowles. The bootylicious star resorted to drastic measures -- the lemonade diet -- to slim down for a role.
  
  

Check out AOL Health for more scary slimdowns.