Autographs?

I've tried, to no avail, for several years to obtain an autographed publicity photo of Keira Knightly. Her agents and publicist don't seem to be too concerned with assisting the fans in forwarding their letters/requests on to her. I have come to learn over the years of collecting that oftentimes this means the star sells autographed stills on their website. I came here hoping to find a "store" link, but alas! there is none.

Any suggestions, fans?
Anybody?