A person familiar with the inauguration tells The Associated Press that the pop star will perform at Tuesday's ball for White House staffers. The source spoke on condition of anonymity because they weren't authorized to reveal the information.
The staff ball is typically a private affair. During the last inauguration festivities, Jay-Z reportedly performed at it.
Pop star Usher started off the proceedings last night with his hit song "Yeah." The concert was chock-full of A-list talent, including Perry, Mindless Behavior and members of the cast of the Fox series "Glee."