Keira And Sienna BFF

Sienna Miller and Keira Knightley have become the best of friends on the set of their new film, The Edge of Love, about famed poet Dylan Thomas.

They’ve become so close, in fact, that they’re house hunting for cottages adjacent to one another. In the film the two feisty, free-spirited women are connected by the charismatic poet, who loves them both. As we revealed earlier this week, 25-year-old Sienna stepped into the role of Caitlin MacNamara - Thomas’s wife - in the movie when Lindsay Lohan pulled out after she was asked to take a drugs test.

We’re told Sienna and 22- year-old Keira have become inseparable on the set in New Quay, Wales, so much so they are currently househunting for neighbouring cottages overlooking the sea there.

We’re told, "Sienna and Keira feel it would be great to have homes there and go on joint holidays once filming stops, so they can keep up their friendship."