Michael Phelps and fiancee Nicole Johnson are expecting their first...

Michael Phelps and fiancee Nicole Johnson are expecting their first child. On Instagram, Phelps wrote, "We found out 8 weeks ago we were expecting. . . . Today we're over 12 weeks and it looks like we're having a boy!!!" Credit: Michael Phelps via Instagram

Olympic gold medalist swimmer Michael Phelps and his fiancee, Nicole Johnson, are expecting their first child.

Each posted the same photo of the couple on Instagram Wednesday, with Phelps, 30, writing, "We found out 8 weeks ago we were expecting. . . . Today we're over 12 weeks and it looks like we're having a boy!!!"

On her own page, Johnson, who was crowned Miss California USA in 2010, wrote, "Today marks 12 weeks and 5 days of us having a little one . . . and yesterday we learned we're having a BOY. We couldn't be happier!!"

The couple, who have dated on and off since 2011, became engaged in February.

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