Keira Knightley hit the town in support of fashion powerhouse and personal friend Karl Lagerfeld as he unveiled Chanel's The Little Black Jacket exhibition in London on Thursday night (October 11, 2012).

Although not in a black jacket herself, the 27 year-old screen siren did keep up with the colour requirements by wearing a black brocade dress with a black handbag to go with it. The event itself was in aid of a book of the same name being released, which features celebrity models wearing the iconic fashion item. The book, a joint project between Lagerfeld and Vogue editor Carine Roitfeld, is a reinterpretation of one of Chanel's most iconic fashion items: the black jacket.

A few of the celebs that make an appearance include Claudia Schiffer, Uma Thurman, Kanye West, Tilda Swinton, Baptiste Giabiconi, Yoko Ono and Sarah Jessica Parker.

Knightley, who has been the face of Coco Mademoiselle since 2006, is rumoured to be trying her hardest to get her designer friend to create her wedding dress, after she got engaged to Klaxons member James Righton.

Given the friendship the two share, and Keira’s dedication to the fashion label, don’t be too surprised if it turns out that Karl has agreed to do her the favour.