Svelte celebrities. I bet some are blessed with fantastic genetics and some workout as hard as rockstars party, and eat healthfully, too. But it's hardly rocket science to speculate a whole host of celebrities take the road to thinness with the attitude Nickelback shares in their song Rockstar, "Cause we all just wanna be big rockstars, And live in hilltop houses driving fifteen cars, The girls come easy and the drugs come cheap, We all stay skinny cause we just won't eat."

The inside scoop from celebrity trainers reveals crazy celebrity diets are the prescription for many aspiring stars to fit into size zero jeans. Here are a few of the nuttier ones, along with healthier alternatives to stay slim:

• Abuse of laxative teas: Teen actresses are gulping down up to ten cups of dieter's tea a day. Beyond serious gastrointestinal effects, all they're losing is water weight. Stay away from laxatives and try to lose fat, not waste. Once you eat and drink the scale goes right back up again.
• Pricey liquid cleanses: An already fit young actress working with one celebrity trainer invested $3,000 in cleansing supplements for a two week liquid/vitamin fast -- zippo solid food. She lasted a week before wolfing down an entire loaf of bread. Only later did she admit her fasting goal was not a cleanse, it was to lose more weight. Ridiculous. Water is the best cleanser.
• Coffee and booze: Here's Nickelback's Rockstar method with a little kick -- just don't eat, drink stimulants and follow it up with plenty of liquor. Yup, I'd be thin, too. But Beverly Hills trainer Gunnar Peterson said working out with a client who tried this method was a joke. Her organs were stressed, she was exhausted and her heart was pounding. Regular meals with a healthy mix of carbs, protein, veggies and fruit is the way to go.
• Lettuce and Swedish Fish: Peterson trained with another actress who took an additional six Spin classes a week and subsisted on lettuce and Swedish Fish. Of course, in total denial, she told the press she lost the weight through yoga and jogs with her puppy. You have to fuel your body with healthy fare, especially after six Spin classes!

Lettuce and Swedish Fish? Not an appetizing pairing.

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Celebrity diets are a constant source of fascination -- we all want to know how the hottest stars achieved their shapely figure, and more importantly, how we can do it ourselves to look as good as them.

But the Celebrity Diet Doctor has taken it a step further by rating the diets of many of our favourite celebs. Here's who made the list:

• Best: Jessica Simpson, Andrea Baptiste, Lenny Clarke from Rescue Me and Ricki Lake
• Worst: Kirstie Alley, Doctor Phil, Beyonce, Ashanti and Britney Spears.
  

Want to know why each person made their respective list? Read his post to find out what the doctor thinks are the healthiest and unhealthiest ways to lose weight.

Who's your favourite or least favourite celebrity dieter?

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