The 24-year-old singer, rumoured to be performing with Coldplay for the Paralympics closing ceremony, arrived in the capital wearing the red Diamond Kush jumper to discuss her collection with high street fashion brand River Island, tweeting: "Off to do some River Island business #fashawn #takeoff."
Rihanna, executive producer for Sky Living's Styled to Rock, recently caused controversy when she stepped out wearing a T-shirt with "C**tLife" emblazoned across it and again when she shared a photo on Twitter of her rolling up a substance while on the shoulders of her bodyguard at Coachella.
Meanwhile, River Island's CEO Ben Lewis has praised Rihanna's sense of style and speaking of their collaboration, he added: "Rihanna is a style icon, from street to chic she enjoys her fashion. As soon as we started to work together we knew this was a perfect fit.
"Rihanna will be designing the collection and we will be sharing our fashion experience with her to develop a range her fans will love. 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."
The collection is set to be released in spring 2013.