Nicole Kidman just revealed her second husband Keith Urban got a special tattoo tribute in her honor. 'He actually has "Babygirl" tattooed on the back of his neck!' the 57-year-old Oscar winner gushed to W Magazine on Tuesday. The 57-year-old country crooner's permanent ink is rarely seen in public thanks to his signature curtains, mullet hairstyle. 'Keith's not allowed to call anyone else Babygirl,' Nicole noted. 'But now, because ...