Michael Phelps girlfriend admits on her Facebook page that she was an intersex baby.

The 41-year-old Taylor Chandler broke the news herself. She has been dating the most decorated Olympian of all time. Phelps is the most well-known swimmer ever.

In the Facebook post, she revealed that she was an intersex baby and her birth name was David Roy Fitch. She decided to change her name as a teenager and later underwent surgery to become a woman, according to the Heraldsun.

Chandler claimed that Phelps, 29, was unaware that she was born intersex and that she did not tell him during their relationship.

Chandler started to date the swimmer before he checked into rehab in September. They met through the hook-up app, Tinder.

The pair met up at the Olympian's Baltimore home to watch a football game, according to what she told Radar Online.

"One thing led to the next, and we made love during halftime," she said.