Hip-hop star Pharrell Williams has signed up to serve as a mentor on Rihanna's upcoming fashion reality show.

Styled to Rock will feature budding designers fighting to win the grand prize of dressing some of the top celebrities in entertainment, and the trendy record producer has agreed to help advise contestants.

The Umbrella hitmaker will star and executive produce the programme when it airs on Style Network later this year (13) and producers are excited to have Williams on board.

Show spokesperson Salaam Coleman Smith tells The Hollywood Reporter, "We are delighted to have Pharrell, who is a driving force in both the music industry and fashion world, serve as a mentor on Styled to Rock. Pharrell's unique aesthetic and commitment to individuality combined with Rihanna's vision for this series will enable our aspiring designers to hone their craft and learn from the very people who set the trends."