The model and singer (who is the oldest child of famed hockey star Wayne Gretzky) and pro golfer’s second son, River Jones Johnson, was born on Monday, June 12, at Cedars-Sinai Medical Center in Los Angeles, a source confirms to PEOPLE.
“Welcome to the world baby boy … we all love you so much,” Gretzky captioned the family photo.
Johnson — currently the world No. 1 — also took to Instagram, sharing the same photo and writing, “I’m so thankful for my family and the new addition River Jones Johnson.”
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Gretzky, 28, and Johnson, 32, were engaged in August 2013 after having dated since before the start of the 2013 PGA Tour season. Gretzky announced the couple’s second child on the way in February, sharing an Instagram snap of herself holding up an ultrasound photo and cradling her growing bump.
“Coming soon … ” she captioned the shot.
Soon after, both of the parents-to-be shared a video revealing the sex of their baby. Taken on a beach, the clip shows Johnson hitting a golf ball off the sand — which then explodes in a cloud of blue dust.
“Another boy!” Johnson says following the reveal, walking toward the camera with his hands in the air.
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The seasoned parents opened up shortly after the birth of Tatum about how having a child has altered their lives, with Johnson telling PEOPLE, “From the first day he’s born, your perspective on life completely changes.”
“Things that were important aren’t important anymore. He’s the only thing that’s really important,” he added at the time.
Gretzky chimed in to give major props to her fiancé, saying, “Dustin’s the best dad, he’s my best friend. He’s been so supportive with me and we’re just there for each other.”