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Nicole Kidman's latest movie role couldn't be more personal.

Next up she'll be on the big screen in Lion, which tells the heartbreaking and heartwarming true story of Saroo Brierley, who was separated from his mother and brother as a child and as an adult goes on a mission determined to find his family.

Dev Patel, Rooney Mara, and David Wenham also star, and Kidman plays Saroo's adoptive mother, a character that is very near and dear to her heart as she is, of course, an adoptive mother in real life to her son Connor and daughter Isabella with ex Tom Cruise.

While discussing the film, E! News' Erin Lim asked Kidman if she would be supportive of the idea if Connor and Isabella told her they wanted to find their birth mothers.

"Yeah, of course," the Oscar winner said. "That's part of my belief on adoption. If a child wants to find their birth mother, I'm absolutely supportive of that."

And speaking of other bridges she'll cross when she comes to them, Kidman and Keith Urban may have each just turned 49, but we were curious as to whether they'd started looking ahead yet to next year's big celebration.

Asked if she had thought about how they'll mark their twin milestones, Kidman told Lim that she honestly hadn't thought about it yet.

"As I said, everyone keeps jumping a year ahead. We're jumping a week ahead," the actress smiled. "That's all we can do in our lives right now."

Kidman didn't entirely brush off the idea of a joint party, however (we were happy to plant the seed, Nicole!), though she and Urban have someone else's big 0-6 to plan long before either turns the big 5-0.

"We'll see," she laughed. "[Right now] we're thinking about Fifi's birthday. She's the next birthday on our list." Fifi, of course, being the couple's daughter Faith Margaret, who turns 6 on Dec. 28.

In the meantime, you can catch Lion in theaters Nov. 23.