A vivid yellow dress gives a glowing Kate Hudson head start in the race for "Most Luminous."

No longer the girl next door, Katie Holmes keeps it simple but chic. Her long, loose hair and coy smile are all she needs to boost the femme fatale factor.

It takes a brave woman to pull off such a short number, but Cameron Diaz has the legs to do it. Ready, set, Stairmaster!

Reese Witherspoon walks the line (successfully, may we add) between sexy and elegant in this corset-inspired number. Plus, royal blue flatters her blonde locks.

Paired with a simple white shift, Eva Longoria’s pink platform pumps steal the show.

With a daughter named Coco, it’s no surprise that Courtney Cox is a stunner in a classic Chanel shift.

With spare accessories and windswept hair, Demi Moore subdues a sultry combination of feathers, sequins and a plunging neckline.

Feathers and lace and sparkles, oh my! Brooke Shields balances the detail with a longer hemline and simple, loose hair.

The modest cut and silver accessories temper the neon-pink hue of Halle Berry’s dress. The color flatters her skin tone and wows the crowd.

Debra Messing takes a walk on the wild side with leopard print. The dark denim and simple gold hoops add polish.

A ruffled blouse lends feminine flair to Geena Davis’s austere, all-black ensemble. 

Queen of her own empire, Oprah is nothing but regal in a luxe peacock-inspired jacket.

Seemingly immune to aging, Sharon Stone shows off her hourglass figure with a silver-accented halter dress.

The Material Girl herself can’t resist piling on glittering accessories to accent the silver stars on her dress.

Jamie Lee Curtis is more posh than corporate in a plum-hued blazer and dress set. Nude pointy-toed pumps add extra oomph to the look.