KEIRA Knightley’s wig in her new 18th century flick The Duchess was so heavy she had to have a resting post specially made for her to lean on in between takes.

Sexy Keira plays scandalous aristocrat Georgiana Cavendish, Duchess of Devonshire, opposite RALPH FIENNES in the forthcoming movie.

She had to don a sky-high Marie Antoinette-style wig for several key scenes.

And co-star HAYLEY ATWELL, who shot to fame on TV’s The Line Of Beauty, revealed that Keira found the wig too heavy for her delicate head and neck.

Hayley, in LA to promote her new movie Brideshead Revisited, said: “I loved filming The Duchess. Keira has a great sense of humour – she’s really funny.

“She had to wear this huge wig that was so heavy. They made her a special board that she could lean her shoulders and head against in between takes so she didn’t topple over or get neck ache! It was funny.”

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