25 Shocking Celebrity Weight Changes
A look at fad diets celebrities have used to shed or gain weight fast.
17 of 27
Seth Rogen
Since first gracing the silver screen, funny guy Seth Rogen has slimmed down significantly by working out with trainer to the stars Harley Pasternak.
The 28-year-old ditched around 30 pounds in nine months.
Next: Renee Zellweger
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