The Umbrella and S&M star bragged about her spring/summer 2013 clothes and accessories collection on Twitter, saying: "My designs will walk the catwalks of London Fashion Week ... It's gonna be MAJAH!"
The collection will not reach stores until Tuesday, March 5. Rihanna added: "Launching at London Fashion Week is a dream come true for me.
"I have wanted to design my own collection for a long time and to present my collection for River Island alongside all of the other great design talent at LFW is a real privilege.
"I can't wait to see the reaction from my fans and the fashion press!"