Nicole Kidman has paid tribute to patients at an Australian children's hospital for keeping her grounded. The actress visited 400 sick kids for a special screening of her new animated movie HAPPY FEET. It was the first time she'd returned to her native country since her wedding to Keith Urban in June (06). Paying tribute to patients' courage at the Sydney Children's Hospital today (18DEC06), she said, "I live in a crazy world of movie-making and fantasy and I always get an extraordinary sense of reality from all of you. "When I was making this film I just thought wouldn't it be lovely to come back and screen it for you all." The Hours star has two adopted children from her previous marriage to Tom Cruise.