The 25-year-old singer gave $50,000 (£32,417) to an 11-year-old fan currently undergoing leukemia treatment on Tuesday evening, after discovering that her six-to-ninth month stay in hospital would mean she would miss Swift's concert in August.
The family of Naomi Oakes, from Arizona, set up a crowdfunding website after discovering her diagosis of acute myelogenous leukaemia at the end of June.
Swift made three $15,000 donations and one of $5,000, along with the message: "To the beautiful and brave Naomi, I'm sorry you have to miss it, but there will always be more concerts. Let's focus on getting you feeling better. I'm sending the biggest hugs to you and your family."
It's likely that Swift saw the video Oakes' family made, which showed how the little g irl had chosen the singer's latest single Bad Blood as her 'fight song'.
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However, it only took Swift two days to make a donation - something that took Oakes, and her family, by surprise:
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