Keira Knightley's tiny waist

Sep 22, 2008, 4:00 GMT

British actress Keira Knightley waits to enter the theatre for a screening of her film \'The Duchess\' at the 33rd annual Toronto International Film Festival in Toronto Canada on 07 September 2008. EPA/WARREN TODA

Keira Knightley has a 23-and-a-half-inch waist.

Justine Gale - who was a body double for the actress on the set of her new movie 'The Duchess' - has revealed the extent of the actress' tiny body.

Justine - who has the same measurements as Keira and tried on all the outfits before scenes - said: "When pulling in my corset, all measurements were checked. I was most thankful for that on the day a new wardrobe assistant mistakenly pulled me into a 22-and-a-half-inch waist. Ouch! I'm sure Keira felt the same? and thankfully I was 'let out' an inch."

"Anyway, any pain was worth it to be able to wear the unbelievably beautiful dresses, some of which were fitted on me just hours before they were worn by Keira and shot on screen."

Keira admits she had some difficulties squeezing into all the restrictive costumes for her role in the period drama.

She explained: "I had quite a few different corsets, and it was really weird because they were all obviously made to measure for me, but some of them I could breathe in, and some of them I absolutely couldn't... and it was a complete nightmare!"

Keira isn't the only celebrity to have a tiny waist.

Kylie Minogue was reported to have a 16-inch waist corset when she went on tour in 2005, while Victoria Beckham is said to have a 23-inch waist.