Rihanna was a no-show at the Grammys because of illness.
She was scheduled to be introduced by late-night host James Corden and perform "Kiss It Better" early in the show but her slot was skipped.
The singer's publicist says Rihanna was examined after rehearsal on Sunday and a doctor put her on vocal rest for 48 hours because she was at risk of damaging her vocal cords.
Rihanna appeared at a pre-Grammy tribute to Lionel Richie on Saturday night, singing his hit "Say You, Say Me."
She had been on antibiotics ahead of the show but her publicist says her doctor concluded her condition hadn't improved enough by Monday night.
It was the second time Rihanna missed a scheduled Grammy performance. In 2009 she canceled after then-boyfriend Chris Brown had beaten her the night before the show.