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From Lena Dunham to Jessica Chastain, the Best and Worst Dressed of the Week

Jessica Chastain stuns in yellow de la Renta, the cast of 'Girls' gets dressed up, and Margot Robbie wears a high-fashion doily. Plus, more best and worst dressed of the week.

Getty (2); AP (2)

Getty (2); AP (2)

Jessica Chastain stuns in yellow de la Renta, the cast of Girls gets dressed up, and Margot Robbie wears a high-fashion doily. Plus, more best and worst dressed of the week.

Ian Gavan/Getty

Best Dressed in Pastels: Lea Seydoux

French actress Lea Seydoux, who's the face of Miu Miu's Resort 2014 campaign, kept things feminine for the EE Rising Star Award photocall on January 6 in a high-neck, long-sleeved, skater-style dress printed with flowers from the designer. She accessorized with a light pink, embellished wool coat by Prada, and mint-green pumps with orange detailing, also by Miu Miu.

Evan Agostini/Invision, via AP

Best Dressed, Sunny Days: Jessica Chastain

Jessica Chastain attended the National Board of Review Awards Gala on January 7 in a yellow, knee-length silk dress and blue pointed-toe pumps with silver and yellow detailing, both from Oscar de la Renta's Spring/Summer 2014 collection.

Andrew H. Walker/Getty

Best Dressed Group of Girls: Jemima Kirke, Lena Dunham, Allison Williams, and Zosia Mamet

For the season three premiere of their hit show, Girls, on January 6, stars Lena Dunham, Jemima Kirke, Allison Williams, and Zosia Mamet were dressed to the nines. Kirke kept to her bohemian aesthetic, sporting a silk, lingerie-style vintage Geminola dress. Dunham stood out, looking fabulous in a silver, sequined dress from Rochas's Spring/Summer 2014 collection with Jimmy Choo heels. Williams wore a girly, short light-blue frock with floral appliqués by Christian Dior, and Zosia Mamet opted for a classic Saint Laurent little black dress.

Jordan Strauss/Invision, via AP

Best Dressed, White Lace: Naomie Harris

Naomie Harris stunned at the Palm Springs International Film Festival Awards Gala on January 4 in a white, lace gown with a black waistband from Naeem Khan's Spring/Summer 2014 collection and Jimmy Choo shoes.

Cindy Ord/Getty

Best Dressed, Tin Woman: Cate Blanchett

For the 2013 New York Film Critics Circle Awards on January 6, actress Cate Blanchett stunned in a silver Antonio Berardi dress, with a peeking red lining, and a coordinating bolero. She accessorized the look with Van Cleef & Arpels jewelry and black Christian Louboutin heels.

Frazer Harrison/Getty

Worst Dressed in a Doily: Margot Robbie

A promising style star, up-and-coming actress Margot Robbie took too much of a fashion risk at the Australians In Film screening of The Wolf Of Wall Street on January 7. Robbie's Delpozo dress looked like an awkward doily pinned upon suspenders, stealing attention from her natural beauty.

Rotello/Rex

Worst Dressed, My Little Fashion Mistake: Rita Ora

Looking fresh out of a Lisa Frank trapper-keeper, Rita Ora partied at the Chinawhite nightclub in London on January 4 wearing a My Little Pony x Alice Vandy collaborative mini-dress and thigh-high Ferragamo boots.