Who: Ashley Olsen

Where: At the Costume Institute Gala at the Metropolitan Museum of Art in New York.
Wore: A long-sleeved, backless white gown by The Row.

See Ashley Olsen\'s Fashion face-off with sister Mary-Kate.

Who: Daria Werbowy

Where: With Matthew Williamson attending the New York launch party for the designer\'s collection for H&M.
Wore: A sequinned kimono mini dress by Matthew Williamson for H&M, cinched in at the waist with a skinny black belt and teamed with black ankle boots.

See our top 10 picks from the Matthew Williamson for H&M collection.

Who: Diane Kruger

Where: At the Costume Institute Gala at the Metropolitan Museum of Art in New York.
Wore: A white floral appliqué mini dress by Chanel Haute Couture accessorised with black court shoes with bow detail, a black Chanel clutch bag and Chanel Fine jewellery.

See more celebrity pictures from the Met\'s Costume Institute Gala.

Who: Audrey Tautou

Where: At a private screening of her new flick Coco Before Chanel at London\'s Soho Hotel.
Wore: A white blouse underneath a black cardigan with grey silk crop trousers, black peep-toe heels and a grey suede clutch.

Who: Leighton Meester

Where: At the Costume Institute Gala at the Metropolitan Museum of Art in New York.
Wore: A printed puff-shoulder tulip dress with embellished leggings and black suede pumps with ankle ties, all by Louis Vuitton.

See Leighton Meester\'s Fashion face-off with Gossip Girl co-star Blake Lively.

Who: Caroline Trentini

Where: With boyfriend Victor Demarchelier at the Costume Institute Gala at the Metropolitan Museum of Art in New York.
Wore: A floor-length draped ivory gown with floral print and silver beaded criss-cross straps by John Galliano accessorised with grey strappy heels and floral motif earrings.

See more celebrity pictures from the Met\'s Costume Institute Gala.

Who: Liya Kebede

Where: Leaving the Carlyle Hotel in New York.
Wore: A cerise, orange and silver sequinned and beaded mini dress by Derek Lam with soft pink ankle tie suede heels, a large blue snakeskin clutch, an oversized gem stone ring and black drop earrings.

Who: Alek Wek

Where: At the Costume Institute Gala at the Metropolitan Museum of Art in New York.
Wore: A bright pink knotted silk dress by Ungaro teamed with black strappy heels, a black feathered evening bag and pearl earrings.

See more celebrity pictures from the Met\'s Costume Institute Gala.

Who: Kate Bosworth

Where: At the Costume Institute Gala at the Metropolitan Museum of Art in New York.
Wore: A floor-length black gown by Stella McCartney with beaded panels and sheer lace sleeves and back.

See more celebrity pictures from the Met\'s Costume Institute Gala.

Who: Kate Moss

Where: At the Costume Institute Gala at the Metropolitan Museum of Art in New York.
Wore: An oyster lamé one-shoulder dress by Marc Jacobs accessorised with gold Special Edition Tribute 2 pumps by Yves Saint Laurent, a turban by Stephen Jones, and sapphire rings and diamond earrings by Harry Winston.


See more celebrity pictures from the Met\'s Costume Institute Gala.

See previous Week in Style galleries.