And as a teenager, the American Idol star rocked a jet black hairdo, complete with a sweeping side fringe, and the star shared an incredible throwback photo of herself sporting this look on Instagram over the weekend.
Fans were quick to comment on the singer's appearance, with one writing: "I thought that was Billie Eilish for a second," while another wrote: "Love your black hair." A third added: "Well that's a throwback. So cute."
VIDEO: Inside Katy Perry's baby daughter's beautiful nursery
The photo – which was liked by stars including Jennifer Aniston and Kate Hudson – was accompanied by the caption: "Alexa, play ' When we were young,' prompting other fans to wonder if Katy was planning on doing a collaboration with Adele, who sang the hit song.
Katy Perry looks unrecognisable with black hair
The Smile hitmaker will no doubt keep her followers updated on her latest project in the near future.
For now, Katy is keeping busy looking after her baby daughter Daisy Dove, following her arrival at the end of August.
The Roar hitmaker welcomed her first child with fiancé Orlando Bloom, who recently appeared on The Ellen Show to open up about his daughter and their first few weeks together as a family.
Katy's daughter shares a name with the star's new single, Daisies
The proud dad revealed that Daisy looks identical to him, but with Katy's blue eyes.
He also revealed that he had scored major dad points after being able to soothe Daisy by chanting to her.
Katy and Orlando Bloom are doting parents to daughter Daisy Dove
"She is [sleeping through the night] it's always a process, she's now sleeping from 9pm-7am which is incredible, it's a blessing," the dad-of-two revealed.
The Roar hitmaker often experiments with her hair
Of Flynn's bond with his baby sister, Orlando told Ellen: "He's very well versed in little babies, his mum has a couple of little bubbas and he's the best.
"He's wonderful. We are all doing a lot of schooling remotely and have been at home a lot and there's been a lot of time for nesting and getting him to help take care of the baby – sort of!"
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