One day after pulling out of a benefit concert citing illness, Rihanna was spotted on Friday in rehearsals for the 53rd Annual Grammy Awards and is apparently still on for the big show on Sunday.

Representatives for Rihanna could not be reached for comment, but the "Umbrella" singer Tweeted that she would be rehearsing despite suffering from bronchitis.

"Bronchitis and laryngitis boo! I'm still goin to rehearsals tho! Sunday is everything," she said in the Tweet.

An official Twitter feed for the Grammys also reported that Rihanna was rehearsing.

"We have not heard anything suggesting she isn't making it, as far as we know she will still be performing on Sunday," Grammy spokeswoman Stephanie Schell said in an email.

Rihanna pulled out of a Thursday night performance benefiting the Women's Cancer Research Fund, citing the flu, USA Today reported. Singer Cee Lo Green took her place.