Rihanna pulled out of her Grammy performance at the last minute on doctor's orders on Sunday. The singer was due to perform "Kiss It Better," the single of her new release Anti, but couldn't because of bronchitis, according to Billboard. Rihanna had been taking antibiotics for three days. She was put on vocal rest for 48 hours after a doctor concluded she "was at risk of hemorrhaging her vocal cords," her rep told Billboard. Rihanna had arrived at Los Angeles' Staples Center for rehearsal, but did not walk the red carpet.