She revealed that the pair devoted hours playing games and learning musical instruments together. "I mean, we're quite nerdy. We talk about books and we play cards and do The Guardian (newspaper) crossword. We were living together in this house in Wales that was really beautiful and we all sort of walked around in our pyjamas and went for long walks," Contactmusic quoted Miller, as telling Starpulse.com.
Their friendship has continued long after the filming was over - and now the two actresses are spending their time together inspiring each other to learn new skills.
"She's (Knightley's) learning the flute at the moment, I'm learning the piano, quite nerdy. I used to play the piano when I was younger and I'm kind of now going back to it, but I can't read music, so I play it by ear. I need someone to play it, so it's a little complicated to do on my own, but it's fun," Miller added.