Keith Urban has hailed wife Nicole Kidman's decision to do the erotic thriller 'Babygirl' "incredibly brave".

The 57-year-old actress plays a high-ranking CEO in film, which she recently branded her most "exposing" project to date, and now her other half has had his say.

He simply told 'The Sunday Project': “She’s incredibly brave with her choices."

She recently told Vanity Fair: "I've made some films that are pretty exposing, but not like this."

Nicole feels particularly anxious about her sex scenes.

The Hollywood star explained: "It's like, golly, I'm doing this, and it's actually now going to be seen by the world. That's a very weird feeling."

Nicole was nervous about watching the movie at the Venice Film Festival.

She told the publication: "There's something in me going: 'Okay, this was made for the big screen and to be seen with people.' I'm not sure I have that much bravery."

The 'Big Little Lies' star hopes the flick proves to be a "liberating story" for women.

She said at the Venice Film Festival: "This is one woman’s story and this is, I hope, a very liberating story.

"It’s told by a woman, through her gaze - Halina [Reijn] wrote it and she directed it - and that’s to me what made it so unique because suddenly I was going to be in the hands of a woman with this material. It was very dear to our shared instincts and very freeing."

Nicole also praised the film's director for helping her to feel comfortable on set.

She said: "I knew she wasn’t going to exploit me. However anyone interprets that, I didn’t feel exploited. I felt very much a part of it.

"There was enormous caretaking by all of us, we were all very gentle with each other and helped each other. It felt very authentic, protected and, at the same time, real."