03/14/2011 at 01:00 AM EDT
The Oscar winner's hue is "completely natural," says her stylist Creighton Bowman.
The singer's hair "is vibrant but not obnoxious," says her colorist Tanya Pacht of N.Y.C.'s Ultra Salon.
The actress uses a clear gloss to "enhance the shine" of her tresses, says stylist Laini Reeves, who works with her.
Kidman's colored locks suit "her inner fire," says stylist David Babaii, who cuts and colors her hair.