Our PicksBest & Worst Dressed of the WeekThe Fashion Beast Team04.04.14Our PicksBest & Worst Dressed of the WeekKate Upton looked classic in WilliamVintage, Charlotte Casiraghi made a stunning post-baby debut, and Rita Ora was a feathery mess. Plus, more best and worst dressed of the week.The Fashion Beast Team04.04.14 9:45 AM ETGettyThe Best and Worst Dressed of the WeekKate Upton looked classic in WilliamVintage, Charlotte Casiraghi made a stunning post-baby debut in Chanel Couture, and Rita Ora was a feathery mess. Plus, more best and worst dressed of the week. Anthony Harvey/GettyBest Dressed: Kate UptonKate Upton looked radiant at the U.K. premiere of The Other Woman on April 2 in a black WilliamVintage dress with an asymmetrical neckline and dangling diamond earrings by Alder. Pascal Le Segretain/GettyBest Dressed: Charlotte CasiraghiFor her first official appearance after giving birth, Charlotte Casiraghi attended the Rose Ball 2014 on March 29 in Monaco wearing a strapless, iridescent light-blue gown from Chanel's Spring 2014 Couture collection. Jason Merritt/GettyBest Dressed: Kate MaraFor the Humane Society’s 60th anniversary benefit on March 29 in Beverly Hills, actress Kate Mara opted for a black-and-white printed look from Balenciaga's Spring 2014 collection and Stuart Weitzman heels. Tim P. Whitby/GettyBest Dressed: Poppy DelevingnePoppy Delevingne celebrated the Victoria and Albert Museum's upcoming exhibit, The Glamour of Italian Fashion, on April 1 in a long-sleeved multi-colored printed gown by Emilio Pucci and a Zagliani clutch. Jason Merritt/GettyBest Dressed: Jessica PareActress Jessica Pare attended the Mad Men season 7 premiere on April 2 in Hollywood sporting a one-sleeve, iridescent green Antonio Berardi Pre-Fall 2014 dress and black patent Christian Louboutin heels. Tim P. Whitby/GettyBest Dressed: Emma WatsonContinuing her incomparable red carpet streak, Emma Watson stepped out for Noah's U.K. premiere on March 31 in a simple white Ralph Lauren gown, a Jimmy Choo clutch, Anita Ko earrings, and gold cuffs by Jennifer Fisher. Tim P. Whitby/GettyWorst Dressed: Rita OraRita Ora looked wild at the preview of The Glamour of Italian Fashion exhibit at the Victoria & Albert Museum on April 1 in London, wearing a white feathery Roberto Cavalli number and sprayed white hair that channeled Nicole Richie's last Met Gala look. Jemal Countess/GettyWorst Dressed: Greta GerwigThe burgundy lace Stella McCartney jumpsuit was too much of a statement for actress Greta Gerwig, who wore the unflattering look to The New Museum's Annual Spring Gala on April 1 in New York City.