Nicole Kidman has spoken candidly about her struggle with Keith Urban's alcohol addiction. 

Nicole Kidman has given a rare and candid insight into how she helped her husband of ten years, singer Keith Urban, in his struggle with sobriety.

Just months after they married, Urban checked himself into a rehab centre, saying that he had “let his guard down” when it came to his ongoing recovery from a long-running addiction to alcohol.

Now, speaking on The Jess Cagle Interview, the actress has offered up advice for anyone who is supporting their partner through a similar period.

"Get help, put your hand up, reach out...there is absolutely help out there," she said, adding that the most important thing to remember is that "you can't save somebody".

Kidman admits that was one of the hardest things for her to realise when she was helping Keith in his struggles.

"It's a very big thing for people like me, who go, 'I can take care of you, I can do it'," she said.

"As much as I thought I could do all the work for him and...said 'I can help', at some point, you just have to say, 'I love you, and I'm here when you decide to do the work and if you don't, then that's it'.

"You cannot save a human being, they have to save themselves. But you can love them and give them enormous support."

Keith often speaks openly of the love and support his wife has offered him throughout his recovery.

"It was very, very hard to have to have her go through that," he told People magazine in 2007.

"Nicole listened to her heart and did what she felt was the right thing to do. To see that kind of love in action, that’s very moving and deeply inspiring and just makes me want to be a better man."