Nicole Kidman Pictures on 45th Birthday

Nicole Kidman and her husband, Keith Urban, walked through Sydney's airport today with their young daughters, Faith and Sunday. The foursome was Down Under to celebrate Nicole's 45th birthday, which was Wednesday. Keith and Nicole marked the occasion by having dinner with her parents and checking out a Lady Gaga concert. There's a lot more for the family to celebrate this week — Monday is Nicole and Keith's sixth wedding anniversary!

Keith just wrapped up shooting the first season of Australia's edition of The Voice, on which he served as a coach alongside Seal and Joel Madden. Next up for him is a big Summer tour, and tomorrow he has a show in Oshkosh, WI. Nicole also has big work projects coming down the pipeline. Her next film, The Paperboy, just got a release date and will hit theaters Oct. 5 of this year.