Keira Knightley Sings the Blues

Keira Knightley arrives at the world premiere of The Duchess at the Odeon cinema, Leicester Square on Wednesday in London, England.

The 23-year-old British actress keeps it fun and flirty in a blue Alexis Mabille number with fishnet detailing the bust and hem of the dress. Keira finished off her look with a simple Chanel ring and black pumps by Moschino.

The Duchess opens in UK theaters everywhere this Friday, September 5. Two weeks later, the film will open in US theaters on September 19.

60+ pictures inside of Keira Knightley singing the blues…