The Umbrella hitmaker has since returned to the spotlight by releasing her fourth album, Rated R, in November (09) and fans had called for her to seal her comeback with a slot at the 2010 Grammys. But 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 31 January (10). She is nominated for two awards for Run This Town, her collaboration with Jay Z and Kanye West .