"We are ecstatic to welcome our new beautiful healthy happy baby girl, Willow Sage Hart. She's gorgeous, just like her daddy. #beyondblessed," she tweeted.
The birth was likely something of a relief to Pink, who's openly discussed a past miscarriage. When she announced the pregnancy in November on The Ellen DeGeneres Show, the "Raise Your Glass" singer told DeGeneres, "I didn't want to talk about it ... but if I was going to talk about it with anyone, it was going to be with you. I worked for [this pregnancy]. It was not an 'Oops.'"
Willow Sage Hart is the first child of Pink, 31, and Hart, 35.