Lily Allen's got the exact same and those are...Chanel!
I had no idea they could be so expensive (I bet they are!)

I AM LOOKING EVERYWHERE FOR THESE!!!!!!!!!!!! they retail at 471! which isnt bad I would pay 600 for these!!! They were made in purple in the US only so outside of the US maybe you can find in green? Ive been callin everywhere for these. i called Australia and noting Canada and nothing. Ive even called Saks and neimans. Im still hunting. I will be calling Italy and Paris soon. I guess they were in a CHanel SWAG bag and Rachel has them so does Kirsten Dunst,, I adore these. If anyone has any leads let me know. Style number A37353