Rihanna collaborates with Beyonce?

Rihanna is reportedly set to team up for a duet on Beyonce's forthcoming album.

The pair, who know each other through Beyonce's husband Jay-Z, are apparently hooking up this month to collaborate on a 'number one smash hit'.

'Rihanna has wanted to work with Beyonce for some time now and after talking about a duet at this year’s Grammys they have finally managed to set aside some time to record together,' a source told M Is For Music.

'The song will feature on Beyonce’s album and will be a number one smash hit for sure.'

The news comes just a day after her new single 'Girls' leaked online.