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Rihanna cancels Grammy performance

The singer, who dropped her eight studio album on January 28, was all set to perform at today's Grammy Awards in Los Angeles.

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But sources tell TMZ that the singer has pulled out of the show at the last minute, despite showing up for rehearsals.

"Rihanna has been struggling with bronchitis and is on meds," a source close to the star told the gossip site.

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"A doctor on site recommended that she pull the plug on the performance because it could permanently damange her vocal chords."

After the Grammy rehearsals, the 27-year-old was forced to leave the Staples Center to head home and rest up.

This is actually the second time that Rihanna has cancelled her appearance at the Grammys - the first time, of course, was after the notorious incident with Chris Brown in 2009.

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