Olympic Swimmer Michael Phelps, Fiancée Nicole Johnson Having A Baby (Photo)

Michael Phelps is going to be a father.

The 18-time Olympic gold medalist announced that fiancée Nicole Johnson is 12 weeks pregnant and the couple is expecting a boy.

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We found out 8weeks ago we were expecting… Today we're over 12 weeks and it looks like we're having a boy!!! #babymp #mp #lifeabouttochange #mpswim ? @djnolan5

A post shared by Michael Phelps (@m_phelps00) on Nov 18, 2015 at 8:02am PST

Phelps currently is training for the 2016 Olympic Games in Rio de Janeiro, Brazil. Johnson was crowned Miss California in 2010.

The couple were engaged in February.