"My life was once whiskey, tears and cigarettes," the singer, 31, tweeted Tuesday. "Now it's snot, tears and the color of poop."
The new mom quickly added, "I do miss the whiskey, though!"
All kidding aside, the singer's husband, Carey Hart, 35, is just as excited about Willow's arrival. On the couple's way into L.A.'s Cedars-Sinai hours before giving birth, "Pink was having trouble walking," a witness recently told Us Weekly. "So Carey had his hand on her back to assist her."
After Willow's birth, the proud pop took to Twitter and declared: "She's gorgeous like mama!"