FLOTUS STYLE: Style of the Union

(Photo: Mark Wilson/Getty Images)

(Photo: Chip Somodevilla/Getty Images)

First Lady Michelle Obama looked radiant in a long-sleeved plum dress designed by Isaac Mizrahi as she listened to her hubby, President Barack Obama, deliver his State of the Union address last night. Mrs. Obama topped off the ensemble with a single strand of pearls. Gorgeous!

Check out the back of the dress:

Work it, FLOTUS!