Rihanna will act as executive producer of the fashion design competition, with a similar premise as Project Catwalk and Project Runway.
The series will debut this summer on Sky Living. Over ten weeks the designers will compete to dress different celebrities, with the eventual winner getting to dress Rihanna for a high-profile festival performance in July.
Speaking of the venture, the singer said "I have been very fortunate to work with some truly amazing designers and stylists throughout my career, and they have been instrumental in making sure my creative vision reaches the stage".
Rihanna added: "I am excited to follow the journey of our aspiring contestants and see how their individuality influences their efforts during the course of the show".
Roberts said "this show is here to discover those people and give them a shot. I'm looking for someone who can think outside the box while using their imagination, someone who isn't going to give up at the first hurdle and ultimately someone who can't be undiscovered anymore".
ITN reports that Rihanna hand-picked Roberts herself to help host the show. Rihanna will mostly work behind the camera but will have an input during casting for the show and the finale.
Check out some of our featured pictures of Roberts' and Rihanna's style.