Her new movie is billed as a 3-D adventure. Well, here's a celebrity fashion adventure from a woman we're not used to seeing make such an impression.

The normally demure Reese Witherspoon kicked it up a notch and delivered some rare fierceness at the Monsters vs. Aliens premiere this week. Yowza...

The mother of two looked simply magnificent in a metallic Rodarte mini, gorgeous gray-and-yellow Balenciaga heels, and fab Farrah Fawcett-like locks.

For a closer look at this talented and beautiful actress showing a bit of a wild side for a change, click to enlarge more Reese Witherspoon photos below:

[Photo Credits: Splash News Online]