Sienna Miller and Keira Knightley have swapped showbiz parties for board games.The actresses, who are currently filming 'The Edge of Love' in Wales, have been shunning nights on the town in favour of backgammon tournaments. A source told Australia's New Weekly magazine: "Sienna is big on board games and she has got Keira hooked too. They think it's hilarious because people assume they would be out on the town every night but instead they are cosied up like a couple of old men, getting all competitive over the backgammon board. "Sienna says she prefers it to a big celebrity party any day."Sienna, 25, and Keira, 22, have become good friends since they were cast in the movie about Welsh poet Dylan Thomas, which was written by Keira's mother Sharman Macdonald. The film will see the two beauties share a steamy scene with co-star Matthew Rhys, who plays the late poet. Sienna recently gushed of her blossoming friendship with the 'Pirates of the Caribbean' star.

She said: "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. I've had a real blast hanging around with Keira."

Tagged in