Rihanna is a One Direction fan

Rihanna sent a surprise video message to Louis Tomlinson's girlfriend Eleanor Calder on her 20th birthday yesterday.

The Bajan star, 24, is currently on a yacht in the Mediterranean but she took time out to upload the clip of her singing Happy Birthday to University Of Manchester student Eleanor.

'@rihanna Thank you so much for doing the birthday message for Eleanor!! Take care X,' Tweeted Louis, 20.

Rihanna first crossed paths with Louis and his One Direction bandmates at the Brit Awards back in February.

She has a particular soft spot for the group's youngest member Harry Styles, 18.

'I watch their videos and I remember thinking, "Wow. He's a star." He seems very sure,' said Rihanna earlier this year.

'It seems, like, it's so natural to him.'

SEE VIDEO Rihanna sings Happy Birthday to Eleanor Calder...

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Anna Duff