Anna Wintour criticises Sienna Miller in Vogue documentary
However she was labelled too "toothy" by Anna Wintour, while other Vogue staffers worried she had "too many fillings" and "unruly hair."
According to OK magazine, the film which recently premiered at Sundance also reveals how much Sienna was airbrushed from the original photographs taken by Mario Testino. Footage shows how two images were used to create the final cover shot, with her head superimposed on a second photo of herself.
"The editors hint at Sienna to cut her hair and she ignores them, which worried them even more. It was funny, but probably not for her," a source said.