The 49-year-old actress was left with real bruises on her back after playing the role of Celeste, a woman who is abused by her husband (played by Alexander Skarsgard), in the HBO limited series.
Kidman says her real-life husband Keith was less than impressed with her wounds, reported Vogue magazine.
"I was really bruised. At one point Keith was like 'I'm going to take a photo of your back because it's covered in deep, massive bruises.' He was devastated seeing it, but then he would say, 'But I have an artist wife!'," Kidman says.