Dad Carey Hart shared two new photos of his little girl rocking the new purple hue.
"Have you met my daughter Wednesday Addams???," he joked, before adding the hashtag: #MyDaughterIsMorePunkThanYours.
Willow first debuted her new look when she appeared on stage with her mum Pink at one of her Beautiful Trauma concerts in Los Angeles last week.
And it looks like Willow's new hairstyle is here to stay, at least for a little while anyway. Carey shared a photo to wish his daughter a happy 7th birthday a couple of days after she first showcased her coloured hair, and she was still rocking it.
"Happy 7th birthday to my bad ass daughter Willow!!!!! I love this little girl more than life itself. She is becoming such a strong, smart, sensitive, little girl. I’m so proud of everything you are and I enjoy every moment we are together," he wrote.
"Even when you are giving me a hard time! Happy 7th big girl, your mamma, little brother, and papa love you around the moon 10 million times and back."