British actress Sienna Miller loves working on her new movie - as she's made a "friend for life" in co-star Keira Knightley. Miller stars with Knightley in new movie The Edge Of Love, and the two girls have formed a strong friendship off set. The Layer Cake star says, "I love Keira. She is so nice and she gets me and where I'm coming from. We always chat about how weird the public attention is and boys. "I've found a new friend for life."