Nothing Says 'Best Time Of Our Lives' Like Watching Keira Knightley and Sienna Miller Act Out Lesbian Little House On The Prairie Porn

Clearly Keira and Sienna have gotten, uh, extra-close while filming The Best Time of Our Lives with Matthew Rhys. So close that they love to play "games" together even when they're not filming. Games that involve grabbing your colleague from behind while your male co-worker watches.