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Olympics - Previews - Day - 1

LONDON, ENGLAND - JULY 26: Missy Franklin of the USA Swim Team speaks during a press conference at the Main Press Center on July 26, 2012 in London, England. (Photo by Ryan Pierse/Getty Images)

Swimming phenom Missy Franklin

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