Barack Obama's big inauguration day is approaching! Tons of our fave stars will celebrate with a concert on the National Mall on Sunday, but who will be belting out the tunes for Barack and Michelle's first dance on Tuesday night? Beyoncé! She's been vocal about wanting to be a part of the inauguration since Obama won, and now she's getting her chance! What will she sing? "It is our hope that we can keep the song secret until the moment," spokeswoman Linda Douglass tells the AP. We hope she appropriately belts out "At Last," like she did in Cadillac Records. What do you think she'll sing? Tell us below!