In one photo, Beyonce holds the "Star Spangled Banner's" sheet music. She also snapped a photo of the tape marks where the Obamas and Bidens are supposed to stand.
The 31-year-old singer earlier spoke about how much the opportunity meant to her.
"Every time I am overworked and in a stressful situation, I always think about moments like this," Beyonce told Zap2It Friday. "And it makes everything worth while."
"I can't really think about it until it is over. It is too much! There is no way I would be able to sing," she said.
Here's Beyonce's incredible performance of Etta James' "At Last" in 2009.