Nicole Kidman and Keith Urban took their daughters, Sunday and Faith, to her parents' 50th anniversary bash in Sydney, Australia, on Sunday. The actress wore a floral dress for the occasion, while little Faith, who will turn 3 next week, sparkled in a sleeveless silver dress. Nicole and Keith smiled throughout the celebration of Janelle and Antony Kidman's enduring love, which took place just one day after Keith flew to Sydney. The singer was in LA, working alongside Jennifer Lopez and Harry Connick Jr. on the new season of American Idol, which will debut on Fox in January. The family plans to stay in their native Australia to celebrate the holidays, which includes plenty of sing-alongs. Keith revealed the family's holiday tradition and how thankful he is to be surrounded by Nicole and their daughters in a recent interview.