Michael Phelps Celebrates Son's First Birthday With Heartwarming Photo

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Happy birthday, Boomer Phelps!

Michael Phelps and his wife, Nicole Johnson, celebrated their son's first birthday by sharing adorable photos of their little kiddo to Instagram on Friday.

RELATED: Michael Phelps and Nicole Johnson Celebrate Their Wedding With Another Bash 

The 31-year-old Olympic gold medalist shared a throw back photo of the day Boomer was born, writing, "One year ago, Nicole and I had the privilege to welcome Boomer to this world. For me, it's the best thing that ever happen to me!!"

Nicole also took to Instagram to share a sweet snapshot of Boomer, sporting comfy-looking black pants with white stars. The mom accompanied the pic with a handful of Boomer's milestones.

"On and off his cars, in and out of his wagon, climbing on everything but also turning around to get down, drinking from his own cup, making a drum out of anything, clapping when he hears an audience clap and so much more," she wrote. "Happy early birthday to the most special gift we could have ever asked for ?."

Days before Boomer's big day, his parents were getting ready to celebrate with their tiny tot. "I think Boomer was practicing for his cake smash this weekend with his morning," wrote Nicole on Instagram. The little one also received an early birthday gift, a monkey stuffed animal -- which he happily accepted!

RELATED: Michael Phelps Covers 'Sports Illustrated' Wearing All 23 of His Gold Medals, Says Retiring Was a 'No-Brainer' 

Phelps and Johnson secretly wed in June 2016 after dating on and off for eight years. The couple then held a private ceremony in Mexico back in October, and celebrated their nuptials a third time with friends and family on New Year's Day.

For more on the couple, watch the clip below!

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