Marriage

Michael Phelps, Nicole Johnson hold beach wedding months after legal marriage

In this Aug. 9, 2016, file photo, United States' swimmer Michael Phelps celebrates winning his gold medal in the men's 200-meter butterfly with his fiance Nicole Johnson and baby Boomer during the swimming competitions at the 2016 Summer Olympics, in Rio de Janeiro, Brazil.

In this Aug. 9, 2016, file photo, United States' swimmer Michael Phelps celebrates winning his gold medal in the men's 200-meter butterfly with his fiance Nicole Johnson and baby Boomer during the swimming competitions at the 2016 Summer Olympics, in Rio de Janeiro, Brazil.  (AP)

Four months after getting legally married to Nicole Johnson, Michael Phelps is celebrating in Mexico.

The 23-time Olympic gold medalist shared an Instagram photo Sunday of him walking down the aisle with the former Miss California USA, captioned, "My best friend.... I love you!!" Johnson also shared a picture of her walking with Phelps on a beach while dressed in a wedding gown.

My best friend.... I love you!!

A photo posted by Michael Phelps (@m_phelps00) on

Neither Phelps nor Johnson said where the ceremony took place, but several media outlets report it was in Cabo San Lucas, Mexico.

It was revealed last week that the couple legally got married in Arizona on June 13, and Phelps acknowledged that he had "been married for a while" in a Facebook Live video posted Thursday.

Phelps and Johnson's son, Boomer, was born in May.