The 35-year-old actress, one of the most promising rising talents in Hollywood, found a huge billboard ad for Yves Saint Laurent's Manifesto perfume featuring herself plastered on one of the buildings and she decided to have her picture taken in front of the ad.
"Ok here's pic of me geeking out on my YSL campaign. I was in Paris for fashion week and look what I stumbled upon! It was as tall as a building. It was super embarrassing but I had to jump out of my car and seize the moment. I mean, how many times does a girl get a billboard over the Seine River!?," Chastain wrote on her Facebook page.