Rihanna has lit up Barbados Carnival, stepping out in her hometown in dazzling style. The “Diamonds” hitmaker, 38, wowed onlookers while attending Grand Kadooment Day on Tuesday, August 4, as part of the annual celebrations. A shimmering rainbow of glittering jewels and feathers, she rocked a barely-there one-piece as she walked in a parade. In photos captured and shared via Instagram by Backgrid, Rihanna was seen standing posing for snaps with fans and local authorities as a giant set of fluorescent wings towered over her from behind. She completed the incredible ensemble, sported on the final day of the annual Barbados Carnival’s Crop…