Nicole Kidman gushes about her 'profound' adopted children Isabella and Connor Cruise as she reveals her latest film is 'a love letter' to them

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She is notoriously private about her brood, especially so of her two eldest children - Isabella, 24, and Connor, 21, - whom she adopted with ex husband Tom Cruise in her twenties.

Now, Nicole Kidman has opened up to The Guardian about the deep understanding she has for her kids after she starred in her new flick Lion, based on the non-fiction book A Long Way Home by Saroo Brierley. 

The story retells the tale of a five-year-old Indian boy Saroo who loses his birth mother and is adopted by an Australian family, and begins his search for his long-lost family using Google Earth decades later.

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Understanding: Nicole Kidman has opened up about the deep understanding she has for her kids after she starred in her new flick Lion, based on the non-fiction book A Long Way Home by Saroo Brierley

Playing his adoptive mother Sue Brierley in the flick, Nicole's character goes through the emotional ups and down of her son's search for home as he tries to reunite with his biological mother.

Describing the film as a 'love letter' to her adopted children, she told reporter Decca Aitkenhead that shooting the movie made her wonder about her two eldest children's birth-family history. 

She said: 'From the minute I held them, I wondered about that. Of course. Because you’re all intertwined. Your destinies somehow all come together.'

When asked if she could explain her feelings for their birth parents, she admitted her emotions echoed that of her character Sue and is proud that her children have two mothers.

'Love letter': Nicole explained that the film is a 'love letter' to her eldest kids Connor and Isabella (pictured above)

Candid: The candid omission comes as a shock for many as the Australian beauty is usually tight-lipped about her relationship with her adoptive son and daughter (pictured with Tom Cruise in 1996)

She added: 'Love. Exactly what Sue felt, which is why I wanted to play Sue. The simplicity of that love. The gift of a child. And again, Sue has that absolutely simple, loving feeling...I'm getting into too personal things now. Their own lives, their choices. But their love is profound.' 

The candid omission comes as a shock for many as the Australian beauty is usually tight-lipped about her relationship with her adoptive son and daughter, following the break-up of her marriage to actor Tom Cruise in 2001 after 11 years together.

Following their split, her adoptive children opted to grow up with Tom in Los Angeles alongside the Scientology church. 

Most recently, her daughter Isabella shocked the world when she tied the knot in a secret ceremony in September 2015 - without her famous parents by her side. 

Happy: Now married to country star Keith Urban, Nicole has two daughter Faith and Sunday Rose with the singer and is happily based in Nashville, Tennessee

Bella married her husband Max in a Scientology wedding at the lavish Dorchester Hotel in London.

Speaking exclusively to the MailOnline at the time, she laid to rest rumors of disconnecting from Kidman since the actress was labeled a 'suppressive person' by Scientology chiefs because she refused to join.

She said: 'Of course [we talk], they're my parents,' she says. 'Anyone who says otherwise is full of s**t.

Now married to country star Keith Urban since 2006, Nicole has two biological daughters Faith Margaret, six, and Sunday Rose, eight, with the singer and is happily based in Nashville, Tennessee. 

Loved-up: Keith and Nicole - who tied the knot in June 2006 during a lavish Sydney wedding - walked the Golden Globes red carpet on Sunday