The 'Moulin Rouge!' actress - who welcomed daughter Sunday Rose, her first child with husband Keith Urban, into the world in July - credited the liquid from the town of Kununurra, West Australia, where she was filming new movie 'Australia', for aiding her and six other women on set to fall pregnant.
Nicole - who also has two adopted children, Isabella, 15 and Connor, 13, with ex-husband Tom Cruise - said: "I never thought that I would get pregnant and give birth to a child but it happened on this movie. Nothing happened in a small way on this film. We had heat and torrential rains and equine flu and then I got pregnant. Seven babies were conceived out of this film and only one was a boy. There is something up there in the Kununurra water because we all went swimming in the waterfalls, so we can call it the fertility waters now."