Stars at the inaugural balls
Katy Perry, Alicia Keys and fun. will perform at the two inaugural balls and a concert in Washington on January 19 and 21.
Usher, John Legend, Smokey Robinson, Marc Anthony, Nick Cannon, Stevie Wonder and Brad Paisley will also sing.
Robinson says he's performed for many presidents, but with Barack Obama in office, "it feels like you're going to your family's" house" when he's invited to the White House.
He says the president and first lady treat him and his wife like family.
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