Keira Knightley has admitted she has lost touch with friend Sienna Miller since filming ended on their movie 'The Edge Of Love'.

The young actress, who played the role of Vera Phillips in the Dylan Thomas biopic, revealed the pair have drifted apart even though they became close friends on the set.

She said; "I love Sienna, I think she's a wonderful actress, but we've been like two passing ships in the night recently.

I think that's lovely but also sad about acting. You get incredibly close to people and as soon as it's over you don't see each other.

I don't think I'm very good at figuring out female friendships. I think they're quite tricky to navigate."

Keira also revealed she discusses her sex life with her mother, playwright Sharman Macdonald.

She told Brtian's Glamour magazine; "Mum and I would always talk about sex. She'd come up to my room, have me roll her cigarettes and then tell me I'd have to have one with her.

It's not the typical mother-daughter thing but we're extremely close.

Mum's a bit mental in a good way. She's this chilled-out hippy mother. My house was always the one where my brother and his mates would be drinking when they shouldn't be."

Meanwhile, Keira has been considering swapping the big screen for the London stage.

The 23-year-old admits she would love to be able to put her acting skills to the test and perform in front of a live audience.

However if she chooses to do so she is determined to make her appearance as low key as possible.

She said; "I can't quite handle the idea of 'Screen actress in big West End hit' and all that.

I would prefer to do something smaller, maybe at the Bush (theatre Bush Hall), which is one of my favourite theatres."