Bodog Beat

The Olympic powerhouse stays mum about his personal life. (Courtesy of M@arcopako at Flickr.com)

Olympic swimmer Michael Phelps refuses to reveal who his girlfriend is. However, he confirms to Extra TV's Dayna Devon that it isn't fellow Olympian Amanda Beard.

"No, I'm not dating Amanda Beard," Phelps said. "I'll say that. I think she has a boyfriend."

However, when the eight-time Beijing Olympic gold medalist was asked who his main squeeze is, he said, "Part of my life is kept to myself. I'm able to relax and be with my friends. Those pretty much are the only people who really know the answer to that question."

Phelps does reveal to Devon that his celebrity crush is actress Cameron Diaz, saying, "She seems like she has a cool personality."

Celebrity blogger Perez Hilton also speculates that Phelps' lady love might be British model Lily Donaldson.

Even though Phelps is done with swimming, there's still plenty of Beijing Olympics betting to be done!