Article continues below advertisementWillow Hart, the daughter of music superstar Pink and former motocross champ Carey Hart, is officially a high school student!The 14-year-old kicked off her first day with a bang on Thursday, September 4, and her proud dad documented the "crazy" moment on Instagram for all to see."My lil girl is growing up and taking the 1st major step in chasing her dream," gushed Carey, 50. "You will be on Broadway one day. So proud of you.