Keira Knightley's musical moves

Keira Knightley's co-star tried to teach her dance routines from 'Mamma Mia!'.

The slender actress - who plays Georgiana Cavendish, the Duchess of Devonshire, in new period drama 'The Duchess' - admits she couldn't get the hang of the intricate moves.

She said: "Dominic is great. He tried to teach me some of the dance routines from 'Mamma Mia!', at which I completely failed!"

Keira also revealed she has more male friends because she finds it hard to deal with female relationships.

She added to Britain's Glamour magazine: "I don't think I am very good at figuring out female friendships. I think they are quite tricky to navigate. I have a lot of friends who are guys and I find that manipulation and jealousy don't come into it as much, whereas those things can happen easily between women."

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