Divorce documents filed by Nicole Kidman reveal the reason she and Keith Urban are breaking up. Keith Urban married Nicole Kidman on June 25, 2006. Related: 18 Country Celebrity Breakups We Never Saw ComingKevin Winter, Getty Images Kevin Winter, Getty Images loading...4 Things We Learned From Nicole Kidman's Divorce Filing1) It Wasn't SuddenKidman filed to divorce Urban in Davidson County (Tennessee) on Sept. 29. Photo by Lisa Maree Williams/Getty Images Photo by Lisa Maree Williams/Getty Images loading...4) The Reason for Keith Urban and Nicole Kidman's Divorce is ... Kidman's filing says both parties have suffered irreconcilable differences.