It seems that Paul McCartney is getting down with the kids in a major way these days.

Late last year, news of his collaboration with Kanye West on the track 'Only One' was announced - and now it's been revealed that he and West have also collaborated with Rihanna.

The trio's collaboration, 'FourFiveSeconds', was made available to download via Rihanna's website over the weekend and is also available to purchase on iTunes. It's the first single from her as-yet-untitled new album.

She also posted this picture to her 39.8 million followers on Twitter: