The 24-year-old's clothing collection will be available from next year.
"I've been wanting to design my own collection for some time. River Island is the perfect partner for me to collaborate with and working with a British, family-run business also really appealed to me," contactmusic.com quoted Rihanna as saying.
"I find London really inspiring and River Island loves to have fun with clothes. I'm looking forward to working with them and creating something really special," she added.
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