Her initiative raised $1.5 million, but she is determined to add to that - and is selling off a special T-shirt she designed in association with Japan's Vogue magazine editors.

In a post on her Twitter.com page, she writes, "The Japanese Birkin T-shirt I designed for Vogue Japan on sale 6/25 at Uniqlo worldwide. $ (money) goes to Tsunami Relief."

Stars including Victoria Beckham, Cyndi Lauper, Nicole Kidman and Blake Lively have also created T-shirts to sell off for the Save Japan Project charity. The garments will be available online from Saturday (25Jun11) and cost $19.90.