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Marion Cotillard, Kristen Stewart, Keira Knightley, Miranda Kerr, Kate Middleton

Jason Merritt, Paul Drinkwater, Astrid Stawiarz,Slaven Vlasic/Getty Images; BAUER-GRIFFIN.COM

Hollywood's leading ladies wowed us once again with fierce fashion this week. Whether hitting an afterparty, red carpet or late-night talk show, several chic stars impressed us with looks ranging from sexy LBDs to show-stopping floor-length gowns.

We noticed more than one lacy lady pop up on the red carpet. Keira Knightley looked anything but blue in a navy Valentino, while Kate Middleton looked lovely in a ladylike Temperley dress with a floor-skimming hemline and long sleeves. Miranda Kerr went for a more revealing look with a Balmain minidress with a plunging neckline that showed off her enviable figure.

Meanwhile, Marion Cotillard, who hopped on the hot black and white trend, flashed a little leg in a less risqué manner with a peekaboo skirt that was part of a longer Christian Dior dress, while Kristen Stewart shook things up with a colorful Peter Pilotto dress for an appearance on The Tonight Show with Jay Leno.

While we applaud Stewart for adding a pop of color to her weekly red carpet rotation, we're kind of obsessed with Cotillard's subtly sexy Dior, which is our favorite dress of the week. Which look is your fave?