The famous singer and actress are currently in their native Australia to celebrate the holidays.
They were spotted out with Sunday Rose and Faith Margaret in Sydney going to church.
The family was spotted walking hand-in-hand as they entered the church to say some prayers ahead of Christmas Day.
The couple got married in 2006 after Kidman, 51, endured a high profile marriage to Tom Cruise.
Nicole spoke about her two adopted children - Connor, now 23, and Isabella, now 26 - with ex-husband Tom becoming members of Scientology.
She said: "They are adults. They are able to make their own decisions. They have made choices to be Scientologists and as a mother, it's my job to love them.
"I am an example of that tolerance and that's what I believe — that no matter what your child does, the child has love and the child has to know there is available love and I'm open here."
For more details on their trip to church click through the link.
Nicole dressed chic figure for the occasion wearing floral dress teamed with a pastel blue blazer.
Keith looked dapper in a navy blue shirt, black jeans and a pair of quirky chunky boots.
Walking alongside their parents, Sunday Rose and Faith Margaret sported sweet printed frocks.
The family went to a Catholic Church to enjoy their service on Christmas Eve in Sydney.
Nicole was able to marry Keith in a Catholic church because the church didn't recognize her previous marriage to Cruise in the Church of Scientology.
Kidman and Urban like to share their time between America and their native Australia.
The Oscar winner is currently playing the role of police woman Erin Bell in 'The Destroyer.'
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