25 Shocking Celebrity Weight Changes

A look at fad diets celebrities have used to shed or gain weight fast.

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Kevin Federline

Once a toned dancer, the former Mr. Britney Spears ballooned to 240 pounds around the time of his 30th birthday.

Never one to pass up a chance in the spotlight, K-Fed, 35, appeared on VH1's reality show Celebrity Fit Club in 2010 to try to slim down, but he has continued to struggle with his weight.

Next: Kelly Osbourne

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