Actor Brad Pitt wears Ray-Ban 3291 sunglasses on the set of the 2008 movie Ocean's Thirteen. These glasses can not be seen in the movie itself, so are probably (one of) Brad's own shades.

The exact color of the Ray-Ban sunglasses that Brad Pitt is wearing is Silver frame, Grey gradient lenses, color-code 003/8G. Unfortunately these extremely cool sunglasses are discontinued by the manufacturer and very hard to find. A similar pair are the Ray-Ban 3341 which is still available for appr. $129.00, visit Amazon.com for information and images.

Reference: Ray-Ban RB 3291 - Color: Silver frame, Grey gradient lenses (code 003/8G)