Diaz's next walk down the red carpet is likely to coincide with this week's opening of her new movie In Her Shoes, the Curtis Hanson-helmed comedy-drama about the struggle between two sisters. In the movie, Diaz plays the ''pretty'' sister, a young woman who is both misjudged because of her sexual allure (yeah, we know, boo-hoo, right?) and not above using it to get what — and who — she wants.