Katy Perry put on a surprise show in Australia for a young fan with a brain tumor.

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The 33-year-old singer and "American Idol" judge visited Grace Moores at home this week after the 8-year-old missed her concert Monday in Adelaide due to a recent operation.

Perry shared the story in a series of videos Wednesday on Instagram. The clips show the star preparing for the visit and spending time with Grace and her family.

"Today is one of those days where I actually feel like a unicorn," Perry said in one video.

"That's because I get to use my powers for good and meet someone named Grace who wasn't able to come to the show."

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Moores' sister Tiana Moores had reached out to Perry and her fans last week on Twitter, explaining Grace was diagnosed with a 6cm brain tumor this year.

She tweeted about Perry's visit Tuesday.

"GUYS WE DID IT! @katyperry just visited grace! She's truely amazing and such a sweet person this was truely amazing!" Tiana wrote.

Perry is in the midst of her Witness world tour.


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She will perform Friday evening in Melbourne.