Mitchell, who instructed the dancers during the rehearsal to straighten their arms just a bit higher during the rehearsal, was met with a bit of opposition when the First Lady questioned his recommendation.
"What's wrong with it?", asked the First Lady who was clearly enjoying the rehearsal of You Can't Stop The Beat as she could be seen dancing in her seat.
"I see nothing wrong with it", she said.
With many of the performers getting their first chance to be on TV, Mitchell wants everything to be perfect.
Especially since the entire First Family will be in attendance.
"Grandma’s coming, Malia, Sasha -- Bo, if he wouldn’t bark. But he’s not allowed to come", said the First Lady. "The President will be sitting there. Don’t be intimidated. He’s harmless."
President Obama will make opening remarks at the event which will be held in the East Room of the White House and streamed live on www.whitehouse.gov beginning tonight at 7:00 p.m.
Expected at tonight's performance: Elaine Stritch, Margo Lion, George Wolfe, Brian d'Arcy James, and Idina Menzel.
Previous “Performance at the White House” events have featured Smokey Robinson, Jennifer Hudson, Joan Baez, and A Celebration of Music from the Civil Rights Movement, and Fiesta Latina.
First Lady To Through Out First Pitch