There could be another baby on the way for Keith Urban and Nicole Kidman.

The country crooner, 42, doesn’t rule out expanding his family with the Oscar winner, who turns 43 this month, following later-in-life pregnancies for Kelly Preston, 47, and Celine Dion, 42.

“I’m not not trying,” he chuckles backstage Friday during the CMA Music Festival held at Nashville’s LP Field.

There’s no time like the present for the couple who will celebrate four years of marriage later this month. The dazzling duo are parents to Sunday Rose, who turns 2 in July, and her kids Isabella, 17,  and Conor, 15, whom she adopted with ex Tom Cruise.

Is their young tot more like him or her?

“She’s a good mix, I think,” he tells me. “She’s got my wife’s legs, that’s for sure.”

Fatherhood certainly suits the country crooner.

“It’s always something new,” he marvels. “That’s what I love about it. Maybe dads are different, but to me it’s coming on like ‘oh my God, that’s my daughter.’ It’s beautiful. It’s absolutely beautiful. It’s great.”

That nurturing instinct was in effect with season eight American Idol finalist Danny Gokey during this week’s CMT Awards.

“I was walking down the hallway, and Keith Urban called me by him,” Danny recounts. “It was the coolest thing. I was walking with him, surrounded by people, and all of a sudden, he goes ‘Danny, come here.’ I was like ‘oh,’ and I came running over there. He mentioned that his family loved my single, My Best Days Are Ahead of Me. He mentioned a story how they were walking through Nashville Shores, and how they heard it – and one of his kids came up to him and said ‘who is that?’ He was like ‘I know that tone of voice,’ and he heard it, and he went looking in Billboard magazine, and said ‘yep, I was right. We love that song – it’s a great song.’ I was honored. I was speechless, too.”

For Keith, having movie icon Nicole by his side meant giving her a crash course in country starting soon after they met at a G’Day L.A. event honoring Australians in January 2005.

“She had no history of country at all, so it’s been great to be the one to get her into it,” he says. “Not long after we started dating, I actually went to the record store and bought her The Best of Waylon, and I played Are You Sure Hank Done It This Way. I put it in there amongst a bunch of other discs, and I just let that song play first. She was like ‘my word, what is this?’ That was her first real taste of it. From there, she’s gotten into the Zac Brown Band and she loves Miranda [Lambert].”

Catch Keith Urban performing in the CMA Music Festival, which airs September 1 on ABC.

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