Add another feat to Michael Phelps' pile of gold medals. The world's greatest swimmer wed in secret and managed to keep it quiet for months, TMZ reports, meaning the "engaged" couple were already married during the Rio Olympics. As recently as last week, Phelps denied tying the knot on Facebook Live, saying "Nicole and I are looking forward to our big day." In fact, Phelps and Nicole Johnson got a marriage license on June 9 and made it official four days later, per TMZ. His friend and agent Peter Carlisle officiated at the ceremony in Paradise Valley, Ariz., where the couple live. Their baby, Boomer, was born in May. Phelps shared a touching snap on Instagram. (These celebs waited until marriage.)