If you're going to have a Fashion Week, you're going to want Rihanna there. One week after turning heads on the Grammys red carpet, the stylish diva turned up at the Stella McCartney Special Presentation yesterday for London Autumn/Winter Fashion Week — and thankfully, she left her incognito duds at home, instead favoring a sexy deep green number with another slit-up-to-there. We can all agree that Rihanna knows how to wear a dress — it's the superstar's personal life has been more controversial lately thanks to rumors that she'll be collaborating with Chris Brown.