Watch : Keith Urban Changed Song Lyrics Inspired by Nicole Kidman Romance Before Breakup NewsNicole Kidman's latest outing was a family affair. One day after filing for divorce from Keith Urban following 19 years of marriage, the Big Little Lies star proved she's leaning on loved ones as she stepped out in Nashville for a hike with her sister Antonia Kidman. In photos published by Daily Mail Oct. 1, Nicole kept it lowkey for the daytime activity, sporting black leggings with a gray athleisure zip-up and sneakers. Though the Oscar winner has her sister by her side in the wake of the split, her eldest daughter Sunday Rose has not been at home. The day prior, the Oscar winner filed for divorce from Keith, 57, citing "irreconcilable differences" as the reason for their split in the documents obtained by E!