One of the most decorated Olympian's of all time is now a father of two!
Swimming champion Michael Phelps and his wife Nicole welcomed their son, Beckett Richard Phelps, into the world on Monday.
Phelps announced the birth on Instagram saying all are healthy.
He said he feels like the "happiest man in the world."
Phelps married Nicole at a secret wedding in 2016, a year after the couple got engaged.
Their first son, Boomer, was born in May 2016.