Cameron Diaz, Kate Bosworth, Charlize Theorn, Rihanna (Bauer Griffin, FameFlynet Pictures, PacificCoastNews.com)

Denim-on-denim is officially a thing. Finally we can actually wear our Levi's jacket and chambray button-down with our favorite pair of skinnies sans shame—Hollywood says so. The long-taboo trend (thanks in part to Britney Spears and JT) keeps popping up on our favorite stars. From high-fashion hipster Kate Bosworth and pop princess Rihanna to classic dressers like Cameron Diaz and Charlize Theron, the style continues to permeate.

It may be hard to top a blinged-out fanny pack, but who do you think works the look best?
See Rihanna's lookbook:

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