The couple welcomed their second child, a boy, on Monday. The singer announced the arrival of Jameson Moon Hart via Instagram.
According to a 2010 interview with Access Hollywood, Pink and Hart have had the name Jameson in the bank for a long time. "My dad's name is James, and my brother's name is Jason. [Carey and I] are both Irish, Carey's middle name is Jason, and Jameson -- we like whiskey. That's a no brainer," she said at the time.
Jameson was also welcomed by his older sister, Willow, who is now five years old. Pink and Hart were married in 2006. They separated in a brief period in 2008, but reunited in 2009 after the death of Hart's brother.
The "Just Like Fire" singer also shared a picture of her husband with their new son. "I love my baby daddy," she captioned the sweet photo.