02/13/2011 10:38 am ET Updated May 25, 2011

Rihanna Sick; Grammy Performance Still On Despite Bronchitis, Laryngitis?

Can you sing at the Grammys without a voice? One star is hoping she doesn't have to find out.

Pop star and Grammy-nominee Rihanna is in a race against time -- and illness -- to make her scheduled performance at music's biggest night. On Thursday night, she tweeted to a fan: "Bronchitis and laryngitis boo! I'm still goin to rehearsals tho! Sunday is everything."

Things seemed all systems go after rehearsals -- at least as far as one Grammy rep knew, saying, "We have not heard anything suggesting she isn't making it, as far as we know she will still be performing on Sunday."

So what's the latest from the singer herself? Saturday night, she tweeted to Ryan Seacrest, "I'm on every med under the sun! Don't wanna miss a thang!!!"

Thus far, expect to see Rihanna performing, though things could always change last minute.