Report CardFrom Jennifer Lawrence to Justin Bieber: Best & Worst Dressed of the Week (PHOTOS)Isabel Wilkinson03.01.13Report CardFrom Jennifer Lawrence to Justin Bieber: Best & Worst Dressed of the Week (PHOTOS)Kerry Washington hits perfection, Michelle Williams stunned in Burberry, and Natalie Portman opted for Dior. See the fashion highs and lows of the week. Isabel Wilkinson03.01.13 9:45 AM ETGettyKerry Washington hits perfection, Michelle Williams stunned in Burberry, and Natalie Portman opted for Dior. See the fashion highs and lows of the week. Pascal Le Segretain/GettyBest Dressed, We Missed Her at the Main Event: Natalie PortmanAfter the party came the after-party, where loads of people we wish we had seen at the Oscars turned up. A highlight among them: Natalie Portman, who shined in a black and white Dior dress and Anna Hu jewelry. Ian Gavan/GettyBest Dressed, Blue Valentine: Michelle WilliamsAt the London premiere of Oz: The Great and Powerful, Williams looked pretty great and powerful in a blue Burberry Prorsum strapless dress and Jimmy Choo peep-toe shoes. Pascal Le Segretain/GettyBest Dressed, Straight and Simple: Rose ByrneOur Bridesmaids crush on Rose continues—and she caught our eye at the Vanity Fair party in this all-white Lanvin column dress. Pascal Le Segretain/GettyBest Dressed, Queen for a Night: Jennifer LawrenceIt’s almost a week later and the world still can’t get enough of Jennifer Lawrence. Her shining moments were the Dior Haute Couture dress she wore to the Oscars (which, sure, may have caused her to slip on the stairs) and the phenomenal metallic Calvin Klein mermaid dress that capped the evening off. Mehdi Taamallah/AFP/GettyBest Dressed, She Can Do No Wrong: Kerry WashingtonThe Django Unchained actress was, by a long shot, the best-dressed person at the Indie Spirit Awards on Saturday, where she wore a floral Bottega Veneta dress and Christian Louboutin heels. Pascal Le Segretain/GettyBest Dressed Couple of the Week: Diane Kruger and Joshua JacksonThese two are usually spot-on, and Sunday night’s festivities were no exception: Kruger wore a printed Giambattista Valli dress and Christian Louboutin heels; Josh wore an unidentified tuxedo and Berluti shoes. Pascal Le Segretain/GettyBest Dressed, as Usual: Kate BosworthOscar night got a whole lot better when Bosworth showed up, swanning at the Vanity Fair party (also in a Giambattista Valli dress, Casadei shoes, and a braided do.) Jason Merritt/GettyBest Dressed, Winter White: Charlize TheronShort hair never looked this good: Theron, who presented during the show (and appeared in one of Seth MacFarlane’s dance numbers), looked perfect in a strapless, white Dior dress. Bertrand Rindoff Petroff/GettyWorst Dressed, What’s Going On Here?: CherCher arrived to the Balmain show during Paris Fashion Week with a confusing assortment of accessories. Frederick M. Brown/GettyWorst Dressed, Too Much Mesh: Lili SimmonsThe actress showed up at Elton John’s Oscar after-party wearing little more than a piece of tissue paper. Neil Mockford/FilmMagic/GettyWorst Dressed, for Obvious Reasons: Justin BieberThis guy keeps outdoing himself. This time he decided what any sane person would do: wear a gas mask while shopping at the ACNE store at the Dover Street Market in London. Just moseying along!