Natasha Poly's New Hair Colour?

I came across this photo of Natasha Poly on the runway of Chanel, Pre-Fall 2011, and she has her natural brown hair. Those of you who know Natasha know that she had the brown hair before changing to blonde sometime in 2007 I think...not sure. But honestly I prefer the blonde hair on her, so I hope this was just for the show.

Source: Model Couture