David Gabber/PR Photos

WHAT SHE WORE An Yves Saint Laurent draped chiffon design with an embellished neckline and H. Stern jewelry

WHERE The L.A. premiere of G.I. Joe: The Rise of the Cobra

WHY WE LOVE IT Miller went Old Hollywood glam for her umpteenth premiere in an elegant floor-length gown. Walking in flowing dresses makes you nervous? Try giving the skirt a little kick with each step to keep the hem out from under your feet. Practice makes perfect!

CELEBRITY: Sienna Miller

DESIGNER: Saint Laurent

TREND: Gowns

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Sienna Miller

Sienna Miller in Yves Saint Laurent