Guillaume and Stephanie attended the "Home & Living Expo 2018" in Kirchberg
Looks like she's giving whomever is up front a nice view up her skirt. She needs to learn how to sit properly in a skirt.
Since her legs are crossed in another picture is it possible that the photographer just caught her as she was switching legs?
Possibly, but they're not moving at all in the photo, so it appears that she was indeed sitting like that. It's not the first time, either. We all got an unfortunate view of her underwear during National Day two years ago.