Kate's Hair Colour

We've known (I believe) that Kate gets her hair coloured, and certainly her hair colour is much different now than it was in November of 2010, when the couple announced their engagement. Back then it seemed like it was her natural dark brown colour. Now it is warmer and blonder. Take a look:

Personally I would love to see her go back to her roots, no pun intended - I think it actually makes her look younger.