Michael Phelps stepped out with Megan Rossee on his arm last night in London.

The newly-retired Olympic swimming legend, whose work in these games (and all future games) is done, made his red carpet debut with his very pretty, newly-revealed girlfriend Monday at an event for Speedo, one of Phelps' primary sponsors.

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Michael Phelps' girlfriend Megan Rossee gives him even more reasons to smile than 22 Olympic medals. Well, close to it anyway, if they're actually dating.

Following his record-setting run at the 2012 London Summer Olympic Games, Michael Phelps was spotted out celebrating with a “mystery blonde.”

Posted in: Michael Phelps