She's one of the world's biggest pop stars.

But Rihanna is still a small town girl.

And as she heads home to Barbados for Christmas it has been revealed that she has donated $1.75million to a local hospitaThe donation was made in memory of her late grandmother, who died of cancer in June.

The 24-year-old pop star's generous donation led to the radiotherapy department at the Queen Elizabeth Hospital, Bridgetown, being renamed the Clara Braithwaite Centre for Oncology and Nuclear Medicine, in memory of her 'Gran Gran Dolly.'

The money paid for three vital pieces of equipment worth more than $3.5 million Barbados dollars.