The Grammy winner, 20, will perform for the Recording Industry Association of America's Presidential Inauguration Charity Ball, to benefit Feeding America, the nation's largest hunger-relief organization.
"Rihanna's always willing to help out," a source tells PEOPLE. "She’s a good girl."
The Barbados-born singer, who's frequently spotted with hunky singer Chris Brown, shot to stardom with her multi-platinum Good Girls Gone Bad and its single superhits "Umbrella" and "Don't Stop the Music."
Raise AwarenessVicki Escarra, president and CEO of Feeding America, tells PEOPLE: "We could not be happier that Rihanna will be performing at the Inauguration charity ball to benefit Feeding America.
"Rihanna's involvement will help raise awareness about the prevalence of hunger in America and help bring more aid to the 36 million Americans who do not always know where they will find their next meal."
Rihanna promises to be in stellar company come Jan. 20. Sting will be performing at the Creative Coalition ball, while Kanye West is said to be in talks to perform for the Impact Film Fund.