Just a couple of days earlier, Mrs. O was rocking one of her typical conservative layered looks—button-down shirt under a sweater under a belted blazer—while speaking about her Let's Move childhood obesity initiative at Fairhill Elementary School in Philadelphia.
But then yesterday, as she gave music students a preview of the upcoming Governor's Ball performances, she changed things up a little with a sexier Jason Wu dress with a crisscross top and sleeker, sassier bob. Yowza! We're kind of digging this Mrs. Obama.
Get caught up on all the first lady's looks in our Fashion Spotlight: Michelle Obama gallery.