Taking to Instagram to mark the special occasion, the motocross racer wrote: "Willz is gonna be the next major investment banker. We settled on 100 bucks for 1 shot at pulling her tooth out. Was the best money I ever spent, and she got 20 weeks worth of our tour per diem in 5 seconds. #LoveThisKid"
The couple, who have been married for 12 years, also share son Jameson Moon, 18 months. The family is currently on Pink’s Beautiful Trauma tour, which ends in September.
Recently, the mother-of-two opened up about raising her children.
Talking exclusively to PEOPLE, the singer said: 'The thing about parenting is you never know if anything you’re doing is working. That’s been the most humbling thing for me. In my head, I sound amazing and then I turn around and her eyes are completely glazed over. I have no idea. We’ll see.'
Currently, on tour, the entertainer described her own upbringing as 'free range.'
"My mum worked full time and went to school full time. My dad was an insurance salesman," she told the publication. "My brother and I rode bikes to school and played in the woods all day. Lots of rescuing animals, tree climbing, sports, gymnastics. I had a good childhood."
When it comes to her own children, Pink claimed she was embracing more of an attachment parenting style.
"Yeah, I believe in affection," she told PEOPLE. "I believe in needs being met and faith being implemented, and I believe in letting your kids know they can count on you, and that you’ll be there. My parents obviously did not believe in that and I worked out okay. I always tell Willow, ‘I’m going to teach you the rules so that you’ll know how and when to break them.'"
The singer also strives to create a gender-neutral environment for her brood.
"Absolutely. [But] I feel like gender-neutral is in itself a label and I’m label-less,' she says. 'I don’t like labels at all so I believe that a woman and a girl can do anything."
For now, she and husband Hart "try not to take life too terribly seriously."
"We laugh a lot. It’s all about our family unit and time spent together, and much less about external stuff."
This article originally appeared on New Idea.