What is the Brand if the Big purple sunglasses Kat Von D wears?

[Pine Knot]

She has worn them on various episodes of LA INK. SPecifically the one where she breaks the Guinness world record

[Pine Lake]

I haven't seen that kind of sunglasses. You can go to celebrity-sunglasses-finder homepage on Wed nite, Mar 5 at 10PM EST. And their expert, Rays Lite, is going to answer questions on a video chat. If you really want to know, you can send them a pic link during the chat.