Michael Phelps celebrates 19th Olympic gold with son Boomer

Michael Phelps celebrated his 19th Olympic gold with his baby son Boomer.

The swimmer, who is the most decorated athlete in Olympic history, took home a gold medal Sunday night in the 4x100-meter freestyle relay. Though he already had 18 golds, the 19th was special -- it was his first after his son Boomer was born.

• Michael Phelps' baby cheers on dad at Olympic trials

Phelps' fiancee, Nicole Johnson, posted a photo to Boomer's Instagram account saying, "Thanks for sharing your gold medal with me dad!!! I love you and can't wait til I get to see you." In the photo, she and Boomer are talking to the swimmer on Facetime.

We get the feeling this isn't the last time Boomer will see a gold medal on Facetime -- and Boomer has promised on Instagram in a previous post, "I'm ready to go after my daddy re retires."

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• Michael Phelps