Keira Knightley and Sienna Miller bonded on the set of new movie THE EDGE OF LOVE - because they share a passion for children.
The stars' roles in the picture required them to carry around young children and it made them considered having kids of their own.
Miller says, "As a woman you have instincts and you do get a bit broody, definitely. It didn't last, though."
Knightley adds, "The babies were amazing, absolutely gorgeous."