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Stars who've gone from skinny to seriously buff

Slide 1 of 17: <p>從小男孩還變大男孩,暫且不論小賈斯汀多誇張多脫序,看他身材就知道果然是男大十八變。Getty</p>

Justin Bieber showed off his muscly physique at the Fashion Rocks concert

Justin Bieber is obviously proud of his physique... and he wants to show it off! The 20-year-old thrilled fans when he revealed his muscles at the Fashion Rocks concert in New York.Would you believe the picture on the right was taken just four years ago? What a transformation!Click through for more buff bodies...
© Getty
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