Sienna Miller turns to Keira Knightley for support

Sienna Miller turns to Keira Knightley for support.

"We were friends before we did the film and we became even closer," she said. "She gives me good advice and hopefully vice versa. I think we keep ourselves afloat."

Miller added that she relied on Knightley to dissuade her from the "awful temptation" that she had to Google herself, adding that she was often "mortified at what people can write about you".

"It's hard to ignore it," she admitted. "Keira will phone me up. She's like, 'I'm thinking about doing it'. I'm like, 'I am, too, but don't do it'. And we'll kind of talk each other out of it."