The gorgeous dress of first lady Michelle Obama!

For her second-term inaugural ball, First Lady Michelle Obama went back to an old favorite: Jason Wu, the designer whose one-shouldered white gown she wore to the first inauguration celebration back in 2009. This time around, the 49-year-old wore a stunning new creation by Wu, a custom ruby chiffon and velvet gown, as she danced with her husband, President Barack Obama, sworn in earlier on Monday, Jan. 21, in front of the U.S. Capitol.
The FLOTUS -- who debuted her new bangs last week -- accessorized her bold gown with a handmade diamond embellished ring by Kimberly McDonald, and shoes designed by Jimmy Choo.
Michelle joined the President, clad in a tux, for their first dance: This time, it was Al Green's classic "Let's Stay Together," as sung by Jennifer Hudson. Ahead of Monday's very special dance, the President told a crowd he most definitely approves of his wife's talked-about hair switchup."First of all, I love Michelle Obama," he began. "And to address the most significant event of this weekend, I love her bangs. . . She looks good. She always looks good."

The first time President Obama was inaugurated, there were 10 balls to attend. This time around, there were only two. But that didn't stop President and Mrs. Obama from stepping out in their finest. 

Michelle Obama donned Jason Wu for the Commander in Chief's ball, a fire-engine red chiffon and velvet gown accessorized by Jimmy Choo shoes and a ring by Kimberly McDonald. Wu is the same designer the first lady chose to wear to the first inaugural balls, when she wore a one-shoulder white number. 
And the A-list musical guests continued, with Jennifer Hudson and Alicia Keys headlining the festivities. Watch below as Hudson serenades the first couple with "Let's Stay Together" by Al Green.