"I finally met my soul mate," the 53-year-old Olympian said of his paralegal boyfriend. "The more I fall in love with Johnny, the more I fall in love with myself. This is what the universe had in store for both of us."
Louganis competed for the United States in the 1984 and 1988 Olympics, medaling five times. In 1988, he famously suffered a concussion during the preliminary rounds, but still managed to win the gold medal.
"Yes! It is official we are getting married! I love my life and I love Johnny Chaillot!" Louganis tweeted on Monday.
In a March interview with the Backlot, Louganis said he was surprised by his attraction to Chaillot.
It's so funny, generally I usually went for opposites. You know, blonde hair blue-eyed and Johnny, when we first got together it was like, 'We look like brothers.' He has the same skin. The same skin tone, everything. I was like, 'This feels really narcissistic.'
Louganis recently served as coach for the ABC celebrity diving show, "Splash."