Rihanna understands why organizers didn't ask her to perform at the upcoming Grammy Awards - after her bust-up with ex Chris Brown forced her to pull out of the 2009 event.

Both stars were due to sing at the prestigious ceremony in February 2009 but they canceled their slots at the last minute after Brown left Rihanna battered and bruised. The Umbrella hit-maker has since returned to the spotlight by releasing her fourth album, Rated R, in November and fans had called for her to seal her comeback with a slot at the 2010 Grammys.

However, Rihanna insists she won't be taking the stage after she and Brown caused the producers so much hassle last year. She says, "We messed their show up pretty bad last year. They might be a little mad at me."

The 21 year old is expected to attend the event, which takes place in Los Angeles on January 31st. She is nominated for two awards for Run This Town, her collaboration with Jay-Z and Kanye West.

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(This news article provided by World Entertainment News Network)