Michael Phelps has been dating model Megan Rossee for five months, E! News reported.

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Although the couple took their romance public by walking the red carpet Monday night at a Speedo promotional event in London, UsMagazine.com said Phelps declined to answer questions about their relationship.

The U.S. Olympic swimmer, 27, has earned 22 medals, 18 of them gold, during the past three Olympics.

Rossee, 25, has appeared in runway shows for fashion designers Michael Kors and Betsey Johnson.