Rihanna wants to form trio with Winehouse and Duffy

R&B star Rihanna wants to record a "feminist anthem" for her next album with fellow chart-toppers Amy Winehouse and Duffy.

The 'Umbrella' hitmaker has drawn up a wishlist of musicians and producers she wants to work with when she next hits the studio, with Winehouse, Duffy, and Winehouse-collaborator Mark Ronson right at the top.