The Oscar winner reveals that her children - daughter Isabella and son Connor - are beginning to display the trademark rebellious streaks of adolescence, and one of the things that they want to do is get tattoos.
Kidman reveals that daughter Bella has already had ideas about blue hair.
"Bella had a phase of blue hair - luckily that only lasted for a little while. But we recently had a discussion at home about tattoos and I had to lay down some ground rules," Contactmusic quoted her, as saying.
"My husband (Keith Urban) has tattoos, so obviously I don't mind them on principle.