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There's something pretty fishy about Mariah Carey's strict new diet regimen. Make that really fishy.

Speaking to E! News while promoting the premiere of her new series “Mariah's World,” the Grammy award-winning superstar claims that she keeps her figure in check by eating just one thing-- all day, everyday.

“It's really hard. My diet, you would hate it,” Carey said. “All you eat is Norwegian salmon and capers every day. That's it.”

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When pressed for further information, Carey laughed but didn’t back down. “I'm actually serious,” she said. “I try to stick with the proteins. It's the worst.”

Of course, Carey isn't the first celebrity to use extreme dieting measures to stay slim (or bulk up).

“Batman” star Christian Bale lost 63 pounds for his role in 2004's “The Machinist” by eating just a single apple and one can of tuna fish a day.

And Jennifer Aniston once tried a baby food-only diet, losing seven pounds in seven days. Celebrity trainer Tracy Anderson calls the baby food diet a "cleanse" and has claimed it helps boost the body's metabolism.

And there are plenty of other unconventional methods that stars have turned to in order to drop weight quickly.

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Actress Megan Fox has advocated downing shots of apple cider. The technique, Fox claims, “cleans out your system entirely. It will get rid of, for women who retain water weight from your menstrual cycle and all that, it gets rid of it really fast.”

Beyonce is also a big fan of liquid diets and credits the "Master Cleanse"-- a lemonade-type beverage made with maple syrup and cayenne--to her weight loss success while preparing to film her role in the 2006 film “Dreamgirls."