Keira Knightley topless with Cillian Murphy in The Edge of Love

London: Keira Knightley is happy to go topless on screen – because her breasts are ‘so small.’But she has a strict no bottom policy. The Atonement star — who is engaged to Klaxons star James Righton – says doesn’t mind stripping above the waist because her assets aren’t large enough to raise much interest.

She told Allure magazine: “No bottom half! I don’t mind exposing my breasts because they’re so small — people really aren’t that interested!

“But I think it’s much easier as you get older. You can say, ‘No.’ ‘Yes.’ ‘No.’”

According to the Sun.co.uk report, the 27-year-old actress says she finds it amusing when movie chiefs “pencil in” curves for promotional shots — but she admitted she was furious when she was left with “droopy t**s” on the poster for 2004 production ‘King Arthur’.

She told the December issue of Allure magazine: “They always pencil in my boobs.

“I was only angry when they were really, really droopy.For King Arthur, for a poster, they gave me these really strange droopy t**s.

“A. I don’t have t**s anyway and B. They digitally made them, and I thought, ‘Whoa!’

“It’s my face on that poster. I thought, ‘Well, if you’re going to make me fantasy breasts, at least make me perky breasts.’”