It's a #housefullofboys for the Phelps family.

People reported that Olympic swimmer Michael Phelps and his wife, former model and 2010 Miss California USA Nicole Johnson, are parents to three boys after welcoming a son named Maverick Nicolas Phelps Sept. 9.

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The parents announced the news in separate Instagram posts with the same family photo Wednesday.

"Family of 5! Welcome @mavericknphelps to the world! Born 9-9-19," the 34-year-old athlete wrote. Mama and baby are healthy and the boys are pumped to be big bros! #housefullofboys."

"We welcomed Maverick Nicolas Phelps into the world on 9/9/19 at 36 weeks and 2 days," Johnson captioned her post. "Our lil big man was 6lb 5o and 20". He instantly has stolen all of our hearts and keeps me an ecstatic mommy of boys 💙💙💙 I can't wait to walk this journey surrounded by my men. #familyof5"

Just like his big brothers, Maverick already has a dedicated Instagram page. Oldest brother Boomer's page included a post about Maverick's arrival.

"Big brother x 2!!" the caption of the image showing 3-year-old Boomer cradling his brother read. "I’m so excited to have my new baby bro!!"

Middle child Beckett also got a photo with his baby brother.

"I'm officially a Big Brother and I won't let go!!" a post on the 1-year-old's Instagram page said.

Johnson and Phelps married in a small ceremony in Tempe, Arizona, on June 13, 2016 and later had a larger ceremony in Cabo San Lucas, Mexico, on Oct. 29, 2016.