Keith Urban shocked fans this week by changing the lyrics to a song about Nicole Kidman just days before the pair announced they were splitting after 19 years of marriage. Kidman, 58, filed for divorce from her country music star husband on Sept. 30, citing irreconcilable differences as the reason for the split. “The song is about wanting to heal somebody, wanting to take care of somebody, wanting to protect somebody. It’s really like a vow in so many ways.”Kidman and Urban are filing for divorce after 19 years of marriage. ”People close to Keith felt like the split was kind of inevitable.”The pair have reportedly been seperated since the summer.