The singer revealed the exciting news on Instagram, sharing a touching photo of her newborn while unveiling his quirky name.
"Jameson Moon Hart 12.26.16," the 37-year-old penned alongside shot of her cradling her son.
In another pic, proud dad Carey, 41, shares a cuddle with his bub.
"I love my baby daddy 💙," the mother-of-two mused.
Pink, who already shares daughter Willow with her hubby, only revealed her second pregnancy in November.
Confirming the news on Instagram, the So What hitmaker posted a shot of her stunning bump.
“Surprise!” She captioned a photo showing her very rounded baby belly.
In the image, Pink stands on a grassy hilltop, wearing a flowing white gown gazing off into the distance.
Her five-year-old daughter Willow hugs her tummy lovingly.
Pink has long said she wanted to give little Willow a brother or sister.
“My brother is everything to me,” she previously told Billboard. “So I want [Willow] to have family beyond her papa and me."
"For that reason, I mostly want another one for her to have a lifelong friend," she said.
Congrats to the new family-of-four on your latest addition!