Japander

And speaking of Western celebrities advertising products in Japan, the site Japander is the mother of all sites for these ads. Here’s how the site describes itself:

Japander: n.,& v.t. 1. a western star who uses his or her fame to make large sums of money in a short time by advertising products in Japan that they would probably never use. ~er (see synecure, prostitute) 2. to make an ass of oneself in Japanese media.