She had tweeted, 'RETWEET PLEASE! my baby sister is meant to attend @katyperry concert in Adelaide this year but was diagnosed with a 6cm Brain tumour and has been battling all year, grace has love been Katy's biggest fan since she was 3, please help us try and get in contact with @katyperry xx."

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Katy also shared clips of her with Grace's family, on her Instagram story. The pop star is one of the most followed celebrities on Instagram with 71 million followers. Earlier this month, Katy revealed that she had 'bouts of situational depression' as a result of the negative reaction to her 'Witness' album.

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