The actress, 37, looked chic in brown heels, an orange-and-white floral printed skirt, a white tank and a white blazer. But as she walked, a giant gust of wind blew her skirt up, exposing her bare butt.
Witherspoon, mom of three, seemed unfazed, laughing to the cameras and going about her day.
The "Mud" actress recently made headlines on April 19, when she and husband Jim Toth were arrested and booked in Atlanta: Toth, 42, for suspected DUI, Witherspoon for disorderly conduct.
"Out of respect for the ongoing legal situation, I cannot comment on everything that is being reported right now. But I do want to say, I clearly had one drink too many and I am deeply embarrassed about the things I said," Witherspoon told Us Weekly in a statement at the time. "It was definitely a scary situation and I was frightened for my husband, but that is no excuse."
She added, "I was disrespectful to the officer who was just doing his job. The words I used that night definitely do not reflect who I am. I have nothing but respect for the police and I'm very sorry for my behavior."