Rihanna is a trooper! After burying her grandmother ‘Dolly’ just a few days ago in New York, she performed at London’s Barclaycard Wireless Festival in Hyde Park. In true Rihanna fashion, the 24-year-old singer, hit the stage with a uber sexy and revealing two-piece number. Dressed in all-black-like-the-omen, from head to toe, she also sported long, dark hair. Peep some of the pix.