Add Rihanna to the list of celebs who’ll be doing their part during the inauguration of President-elect Barack Obama. The hot singer is headlining the Recording Industry Association of America’s Presidential Inauguration Charity Ball on January 20. The ball will benefit Feeding America. “We are thrilled to have Rihanna’s participation in the inauguration charity ball,” Vicky Escarra of Feeding America told Access Hollywood. “We are most grateful to Rihanna and to RIAA for helping us bring greater visibility to this tragic reality and helping us feed millions more people in need.” Other stars expected to attend the inauguration? Will Smith, Oprah and undoubtedly a slew of other A-listers who’ll turn Washington, D.C. into a mini-Hollywood for the historic event.