New mom Nicole Kidman is giving credit to some Australian Outback waterfalls for her surprise pregnancy. The Aussie actress, who was filming Baz Luhrmann's Australia, was one of seven women who got pregnant after swimming in the waters during production. "I never thought that I would get pregnant and give birth to a child, but it happened on this movie," Nicole told The Australian Women's Weekly. "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." Nicole gave birth to Sunday in July.