Paulina Gretzky and Dustin Johnson Welcome Baby No. 2 -- See the Sweet Family Photo!

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Paulina Gretzky and her fiancé, Dustin Johnson, are "so in love" with their new bundle of joy! The couple welcomed their second child together, son River Jones, on Monday.

The 28-year-old model announced the birth on Instagram with a sweet family photo snapped at Cedars-Sinai Medical Center in Los Angeles.

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"Welcome to the world baby boy..we all love you so much," Paulina wrote on Wednesday, next to a snap featuring Johnson holding their 2-year-old son, Tatum, as he planted a kiss on his baby brother.

READ: Paulina Gretzky Slams Fiance's Haters Over Olympics Controversy: 'He Didn't Work His A** Off for a Gold Medal'

The mother of two also updated her Instagram bio to read, "Mama of Tatum & River," while Johnson posted the same hospital photo to his Instagram account.

"I'm so thankful for my family and the new addition River Jones Johnson," he wrote.

After the birth, Johnson flew from California to Wisconsin compete in this year's U.S. Open. As the pro golfer prepares to defend his championship title, he reflected on the last year by sharing another Instagram photo holding his U.S Open trophy.

"What a great year it's been with the trophy!" the 32-year-old athlete gushed. "So many great things have happened especially Monday afternoon with our second son being born. @paulinagretzky I love you."

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In February, Paulina, who is the daughter of hockey great Wayne Gretzky, revealed that she and Johnson were expecting their second child together with a precious pregnancy photo captioned, "Coming soon."

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