Our PicksFrom Cate Blanchett to Rihanna, the Best and Worst Dressed of the Week (photos)Erin Cunningham07.26.13Our PicksFrom Cate Blanchett to Rihanna, the Best and Worst Dressed of the Week (photos)From Kate Middleton’s incredible post-partum style to Ciara’s leather tube top, a look at the highs and lows of fashion.Erin Cunningham07.26.13 8:45 AM ETGetty (2); Pacific Coast News (2) Solange Knowles goes retro, Piper Perabo wears ill-fitting shorts, and Kate Middleton perfects the post-pregnancy look. See fashion's highs and lows of the week. Neil Mockford/GettyBest Dressed, Brand New Mum: Kate MiddletonThe Duchess of Cambridge is seriously the queen of style. Less than 24 hours after giving birth, the brand-new mum was radiant as she stepped out of the hospital in a blue-and-white polka-dot Jenny Packham dress. Although everyone is dying to get Kate Middleton's post-pregnancy style, the dress is unfortunately a custom, one-of-a-kind piece and will not be sold. Dimitrios Kambouris/WireImage, via GettyBest Dressed, A Princess in Prada: Solange KnowlesSolange Knowles attends the Blue Jasmine New York premiere at MOMA in a complete Prada ensemble. The retro, floral-embellished shirt and skirt set keep the singer looking casual and cool. Getty (2)Best Dressed, In More Ways Than One: Cate BlanchettWith the release of Blue Jasmine, Cate Blanchett has been on everyone's radar. This past week, her outfits have been complete perfection—from the light pink Balenciaga dress and nude pumps she wore in NYC—to the black and white drop-waist Alexander McQueen gown to the film's LA premiere. Macca/Pacific Coast NewsBest Dressed, Disco Diva: Rita OraRita Ora tends to bounce back and forth when it comes to her style choices, but she nails it with this light-pink/gray silk jumpsuit. Arriving at London's The Box nightclub in the long-sleeved Viktor & Rolf get-up, she accessorizes with coordinating heels, hoop earrings, and red lips. Stefania D'Alessandro/GettyBest Dressed, Radiant in Red: Jessica ChastainLeading lady Jessica Chastain attends the 2013 Giffoni Film Festival Blue Carpet in Italy in a strapless lace Dolce & Gabbana gown. Cindy Ord/GettyWorst Dressed, Miss Match: Piper PeraboPiper Perabo visits SiriusXM's NYC studios in unflattering and ill-fitting leather shorts, a mismatched white peasant-style top, and crazy cobalt blue heels. AKM-GSI Worst Dressed, Forgot the Top: CiaraSinger Ciara arrives with her boyfriend Future to her Exclusive Album Release Party at Finale in NYC. While she may have had "sexy" in mind when choosing a leather tube top and black overalls, Ciara definitely missed the mark. ChinaFotoPress/Getty ImagesWorst Dressed, Peace Up: Fan BingbingTypically well-dress actress Fan Bingbing has a fashion faux-pas moment as she attends the "One Night Surprise" press conference in Beijing. She chooses a neon-pink sequined mini, embellished with an oversize peace sign from Ashish's Fall 2012 collection. Pacific Coast NewsWorst Dressed, Wildin' Out: RihannaUnsurprisingly, Rihanna chooses a cut-out, skin-tight red leopard onesie to wear to the Roberto Cavalli Store in London. While her new gray hair may be great, Ri-Ri's clothing has been taking a walk on the wild side—and not in a good way.