This week was all about...classic gowns and killer cocktail dresses. And the winners are...

Dakota Fanning working it in a strapless Valentino dress at “The Twilight Saga: New Moon” Premiere in Los Angeles. The saga newbie managed to upstage, well everyone, in this mature, yet youthful number. Sassy!

Kate Beckinsale in a teal-colored Andrew Gn gown worn to the MOCA 30th Anniversary Gala. I'm going to go out on a limb here and say that this is the best I've seen Kate look, and she looks great 99% of the time.

Heidi Klum rocking a geometrical body-hugger at the 2009 Victoria’s Secret Fashion Show After Party. Just weeks after giving birth to yet another child, Heidi's bod managed to rise to the occasion and then some.

Ashley Greene in Prabal Gurung at “The Twilight Saga: New Moon” Premiere in Los Angeles. While this gown may be simple, its shape and color are nothing short of sensational. Ashley's certainly been having a great week.

Eva Mendes strutting it in a black and tan Miu Miu dress at the MOCA 30th Anniversary Gala. The embellishments along the bodice of this otherwise conservative sheath add an edgy, yet still glamorous, touch.

Check out more sensational celebrity styles in my Fab Five Looks of the Week lookbook.

Photos (left to right): Jason Merritt/Getty Images; Frazer Harrison/Getty Images; Eugene Gologursky/WireImage; Jason Merritt/Getty Images; Frazer Harrison/Getty Images