(CNN)Olympic swimmer Michael Phelps is the proud father of a baby boy.
The gold medalist and his fiancee, Nicole Johnson, welcomed their son, Boomer Robert Phelps, last week, he announced on social media.
"Born 5-5-16 at 7:21 pm!!! Healthy and happy!" Phelps posted. "Best feeling I have ever felt in my life!"
The new addition to his family comes as the 22-time Olympic medalist is training for his fifth Olympic Games, set for this summer in Brazil.
"I want to retire how I want to retire -- and I have a great opportunity to do that," he said.
This year's Summer Olympics will be held in Rio de Janeiro between August 5-21.