Still promoting her new movie "Seeking a Friend for the End of the World", Keira Knightley made a guest appearance on "Late Night with Jimmy Fallon".

She sparkled wearing a Valentino dress from the Fall 2012 collection.

Keeping the accessories to a minimum with just a pair of black pumps, Keira let her black dress with sheer long-sleeves and embroidered silver metallic details do all the talking.

The sophisticated outfit was finished off with a classic bun, smokey eyes and glossy lips.

source: nymag