Human beings. When you think you've got them figured out …

A three-time U.S. Olympian whose illustrious running career has included a Nike TV commercial, a swimsuit calendar, and ongoing promotional work for Disney has spent the last year doubling as a $600-an-hour call girl, an astounding secret life that she now regretfully calls a “huge mistake.”

Beginning last December, Suzy Favor Hamilton, 44, has worked with one of Las Vegas’s premier escort services, booking scores of “dates” in Sin City and other U.S. cities, including Los Angeles, Chicago, and Houston.

While Favor Hamilton (seen at right) has used an alias, “Kelly Lundy,” when working as an escort, she inexplicably shared her true identity with several male clients, believing that her secret was somehow safe with strangers who paid for her company by leaving envelopes stuffed with cash on bathroom vanities in swanky hotels.

When approached by a reporter earlier this month in the lobby of a Las Vegas hotel, Favor Hamilton initially denied any connection with the escort service, Haley Heston’s Private Collection. But Favor Hamilton--who is married to her college sweetheart, a lawyer, and is the mother of a seven-year-old girl--eventually acknowledged her work as “Kelly.

The Smoking Gun has the rest of the details.