she once said in an interview that, "I cut my hair really short once and bleached it. So much so, that it ended up turning grey! It was my agent's idea at the time and I cried all the way home on the subway. I looked like a cotton-bud. The only good thing that came out of it was that, ever since then, my hair is a lot thicker now!"
maybe it's the time of this blonde hair look?