PARADISE VALLEY, Ariz. — Michael Phelps took the plunge in June, secretly marrying his longtime girlfriend two months before the Olympic great completed his last gold-medal haul.

The Arizona Republic reported the 31-year-old swimmer wed Nicole Johnson on June 13. That’s a little more than a month after the former Miss California USA gave birth to their son, Boomer.

The newspaper posted a copy of a marriage license that shows Phelps and Johnson were married in Paradise Valley, Arizona. Neither Phelps nor Johnson said anything about the wedding. Johnson posted a picture of her with Phelps and Boomer on Instagram on the day of the ceremony with the caption: “Such a memorable night with my lil fambam.”

Phelps won five gold medals at the Rio Games, his last coming Aug. 13 to increase his overall gold total to 23. He is the most decorated Olympian with 28 medals.