Hails From: Baltimore, Maryland
Medal Count: 16!
Most Memorable Moment: Winning eight gold medals and setting a multitude of records at the Beijing Olympics in 2008, including that for the most olympic gold medals, for which he has 14.
Where Are They Now?: Preparing for the seven events he recently qualified to swim at the London Games, where his most heated competition is none other than teammate (and Vogue cover model) Ryan Lochte.
Betchya Didn't Know That: While Phelps brought home the gold in 2004 and 2008 games, he also participated in the 2000 Olympics when he was just 15 years old, but came home empty-handed.
Photo: Mark Humphrey/AP/Corbis