The gold medallist and Nicole Johnson became engaged in February (15) and now they're preparing to become parents next year (16).

"We found out 8weeks ago we were expecting...," Michael writes on "Today we're over 12 weeks and it looks like we're having a boy!!!"

The happy news comes a year after Phelps was pulled over for speeding in Baltimore, Maryland (Oct14), and charged with driving under the influence, excessive speeding and crossing double lanes.

He subsequently checked into a rehabilitation facility and was hit with a six-month suspension from USA Swimming-sanctioned competitions and given a one-year suspended sentence and 18 months probation for the DUI count. He is now sober and training to compete in the 2016 Olympics in Rio de Janeiro, Brazil.