Swimming phenom Missy Franklin

Associated Press
United States' Missy Franklin starts in a women's 100-meter backstroke swimming heat at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Sunday, July 29, 2012. (AP Photo/Mark J. Terrill)

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Missy Franklin's four gold medals in London haven't changed her personality one bit – she's still a happy-go-lucky teen.

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