No one was more surprised by the announcement than Taylor Liane Chandler, Dana Shapiro, Keshia Miller, and the several other women who say they were romantically involved with Phelps at the time that he decided to settle down with Johnson.
Several of the women have spoken out in retaliation, and in the past month, we've learned about everything from Phelps' penis size to his bizarre bedroom kinks.
But despite the many shocking tales from Phelps former mistresses, no one has provided a better look into the Olympian's quirky love life than professional dominatrix Kim Petro.
Petro recently spoke with the National Enquirer, and the tabloid even gave the 36-year-old sex worker a polygraph test to substantiate her claims.
It's a good thing, because otherwise, we would've had a pretty tough time believing her story:
"When he said drink some water before I got to the hotel, I knew what I was in for," says Petro. "I was going to go to the bathroom anyway - I figured I might as well get paid for it."
Yes, it seems that Phelps like his showers like he likes his medals - golden!
Petro says that she and the swimmer smoked pot, he stripped down ("He was definitely impressed with his body and showing it off.") , and then she indulged his water sports fetish.
"I got above him to do the golden shower," says Petro. "After I was done, he asked if it was okay to [pleasure himself]."
Petro added that she generally doesn't allow clients to masturbate, but decided to make an exception for Phelps.
She also says that Phelps had a string tied around his genitals for some reason.
"I grabbed the string and pulled, and took out my breasts because he wanted to see them," says Petro.
Just another day in the strange, kinky life of Michael Phelps.
Nicole is ready for some football! The future Mrs. Michael Phelps posted this photo of herself sipping some coffee and rocking a Peyton Manning jersey.
If Nicole loves Michael Phelps as much as she loves selfies, she should have quite the successful marriage. Here's one of Nicole's many Instagram uploads.