Michelle Obama [1] has been leading the charge when it comes to fully embracing the arrival of Spring fashion. After wearing a short-sleeved floral dress [2] and a colorful ensemble [3] to recent engagements, Michelle has proved once and for all that it's time for Spring fashion — for real.

For a Let's Move! event with bloggers at the White House on Tuesday, Michelle wore yet another stunning and perfect-for-warmer-weather look. She selected a sleeveless light-brown dress, which was complete with a zipper detail up the front. The emphasis on seasonality was similar to the lovely, floral Jason Wu strapless gown [4] she sported to last week's official state dinner. Read on for more photos of Michelle's latest great look.