Cheryl Cole and Katy Perry are among the star guests to appear on Rihanna's new fashion TV show Styled To Rock, it has been revealed.
The Umbrella singer produces and stars in the show for Sky Living, which sees her searching for the next big thing in fashion from among 12 unknown designers, and helped by mentors - Girls Aloud's Nicola Roberts, fashion designer Henry Holland and stylist Lysa Cooper.
Each week a guest artist will appear on the show to set the aspiring designers a challenge - and these will include Nicola's bandmate Cheryl.
Rihanna in her first TV show
Nicola revealed: "I text her to persuade her to come on and she was totally up for it. She loves anything like that and I think the fact it was undiscovered talent and these fresh, young designers, she loves her clothes so it was just a given and she really enjoyed it."
At the end of 10 weeks, the final challenge to determine the winner will be to design a stage outfit for Rihanna to wear at her biggest London live gig in 2012.
Nicola Roberts at the launch of Styled To Rock
Other guest stars setting challenges along the way include The Scissor Sisters, The Saturdays, Pixie Lott, Rizzle Kicks, Tinchy Stryder, Little Mix, Katy B and Little Boots.
Meanwhile, DJ and songwriter Calvin Harris has created and produced the title music for the show and celebrity hairdresser Nicky Clarke and his creative team will create the overall looks for the designers to showcase their outfits each week.
:: Styled To Rock has been made in association with Diet Coke an airs on Sky Living HD at 9pm on August 14 2012.