"But I'd rather be lumpy and heavy than skinny and miserable."

Although most celebrities are quick to deny being the subject of airbrushing - which can digitally remove wrinkles, blemishes and even double chins - the Factory Girl star is not the first celebrity to admit to being the victim of digital trickery.

Keira Knightley recently spoke of her fury at discovering that American movie posters for her film, King Arthur, had been airbrushed to give her a bigger chest.

Speaking at the time she said: 'I did one magazine and found out you're not actually allowed to be on a cover in the U.S. without at least a C cup because it turns people off.

"Apparently they have done market research and found that women want to see no less than a C cup on other women.

"Isn't that crazy? So they made my t**s bigger for that as well."

Similarly, four years ago, British actress Kate Winslet hit out at a men's magazine after it published a heavily touched-up photograph of her on its front cover.

In it, she appeared with thinner thighs and a flatter, nearly concave, stomach, prompting her to say shortly after: "I do not look like that and I do not desire to look like that."

For her role in Factory Girl, in which she stared as Andy Warhol's anorexic muse Edie Sedgwick, Miss Miller refused to use a body double for any of the sex scenes.

She did though admit to relying on soft lighting to give her naked silhouette a more flattering outline.

The actress, meanwhile, who has been linked to Kate Moss' ex-boyfriend, Jamie Burke, insisted that she is still single.

In the same interview with American magazine, In Touch Weekly, she added: "Frankly, I don't know how many men I'm supposed to be dating this week." 'I'd be exhausted if it was true.'

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