Boomer, Beckett and Maverick are getting a brother or a sister.

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Michael Phelps and his wife Nicole Johnson announced on social media that they will soon become the parents of four children.

They’ve been married since 2016 and have three sons — Boomer, 7, Beckett, 5 and Maverick, 3, People reported.

Johnson shared several photos on Sunday to mark their wedding anniversary.

They haven’t announced the gender of the baby, but one commenter noticed that the hearts she used were blue and asked them if they were expecting another boy.

Phelps earned 23 gold, 3 silver and 2 bronze medals over his Olympic career. He is the most decorated Olympian of all time after competing in 2000, 2004, 2008, 2012 and 2016.

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Through the years 18 Sep 2000: Michael Phelps of the USA in action during the Mens 200m Butterfly Heats at the Sydney International Aquatic Centre on Day Three of the Sydney 2000 Olympic Games in Sydney, Australia. \ Mandatory Credit: Ross Kinnaird /Allsport (Ross Kinnaird/Getty Images)

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