Rihanna launches her River Island collection

Rihanna launched her collection for River Island last night in a thigh-high split black dress while attending the at the Oxford Street River Island store in London

According to Rihanna, designing the collection was 'a dream'.

"From where we started, from jotting these down on napkins and pieces of paper in the hotel room in the middle of the night."

"It's scary. I mean, I'm so happy. I can't even believe it," she said.