Beyonce Reveals Song For Obamas' First Dance At Inaugural Ball

Classic song is connected with 'Cadillac Records,' which B recently starred in.

[artist id="1236911"]Beyoncé Knowles[/artist] has disclosed the song she'll be singing for Barack and Michelle Obama's first dance on inauguration night Tuesday.

"I am so honored that I will be performing for President Obama and the first lady," she said in a statement to "Entertainment Tonight." "To sing 'At Last' while they have their first dance is a dream come true. I could not be more honored and excited that they have asked me to be part of this moment in history."

The song, of course, was made famous by Etta James — whom B portrayed in the recent "Cadillac Records" — and has frequently been covered by Christina Aguilera.

Also on hand and performing at the event will be Beyoncé's husband, Jay-Z, as well as Mariah Carey, Alicia Keys, Shakira, Sting, Faith Hill, Mary J. Blige, Stevie Wonder, Maroon 5 and a DJ set by Nick Cannon. Among the presenters at the ball, which will be telecast by ABC, are Denzel Washington, Jessica Alba, Leonardo DiCaprio, Ray Romano, Jamie Foxx, Queen Latifah and Kate Walsh.

In addition to the previously announced all-star inaugural balls occurring all weekend long, the Presidential Inaugural Committee has released the full roster of entertainment at Tuesday's official regional balls:

» President Obama Home States Ball: Common, Jack Johnson, Don Cagen Orchestra

» Vice President Biden Home States Ball: Maroon 5, James Gerard Orchestra

» Mid-Atlantic Ball: The Dead, DJ Cassidy

» Midwestern Ball: Sheryl Crow, Fabulous Motown Revue

» Western Ball: Marc Anthony, Party on the Moon

» Eastern Ball: James Taylor, Liquid Pleasure with Kenny Mann

» Southern Ball: The Derek Trucks Band with Susan Tedeschi, Wil Gravatt Band

"Be the Change: Live From the Inaugural" will air live on MTV on Tuesday, January 20, at 10 p.m. ET/ 7 p.m. PT. MTV News will have wall-to-wall coverage of the event and of the scenes in Washington, D.C., New Orleans and Kenya in the days leading up to the event and in the days that follow.