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4. Kevin Federline
Federline is one of those celebrities by-proxy. No one would know who he was if he was not married to Britney Spears and if he did not have children with the pop star. Even though they split up a long time ago, it is interesting to note that both Federline and Spears have been struggling with their weight a lot and that both love eating junk and fast food.
When the two met Britney was one of the biggest pop stars in the world and Federline was a very in-shape dancer with a great, toned body. But after the breakup, he retreated from the spotlight and apparently spent more time at McDonalds than at the gym. He hit 240 pounds before his 30th birthday.
Of course, Federline tried to make the most of it by appear on the Celebrity Fit Club show, a Vh1 reality show in which celebs try to slim down. However, he continued to struggle with his weight problems after the show had ended.