Miller praises 'flawless' Knightley

Sienna Miller has lavished praise on her fellow actress Keira Knightley.

The movie beauties forged a close friendship while shooting their forthcoming film The Edge of Love, but Miller insists that their bond will last because they both understand the pressures of celebrity life.

She said of Knightley: "I adore her and she is a flawless actress. She works so hard, and she's so sweet, funny and self-deprecating and kind. Literally she'll be a friend for life. I'll love her until the day I die.

"There are elements of (fame) - whether it seems glamorous from an exterior point of view or not - that are really, really hard to deal with.

"Keira is finding it hard, and I'm finding it very hard, so to be able to talk to each other and say, 'Yes, this is really difficult and I understand,' is great."