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Michael Phelps is a father: Fiancée delivers son of swimming champion

Michael Phelps is now one proud papa.

Phelps, a U.S. Olympic swimmer, and fiancée Nicole Johnson welcomed son Boomer Robert to the world on May 5.

According to Phelps, Johnson and baby Boomer are healthy and doing well.

Phelps, 30, won't be able to help out with diaper duty too long; in a couple months he will be in Rio de Janeiro for the 2016 Summer Olympics, where he hopes to expand his world-record swimmer's collection of 18 gold medals.