Nicole Kidman has filed for divorce from Keith Urban, according to documents obtained by Fox News Digital.Kidman, 58, cited "irreconcilable differences" as the grounds for divorce, noting "marital difficulties," after nearly 20 years of marriage.The "Big Little Lies" actress listed Sept. 30 as the date of separation from Urban, and requested to be named the primary residential parent of their two minor children.NICOLE KIDMAN AND KEITH URBAN'S MARRIAGE BREAKDOWN ‘HASN’T BEEN A SECRET' AMONG INNER CIRCLE: REPORTIn Kidman's filing, the Oscar-winning actress asked to be granted an "absolute divorce" at the final hearing.Representatives for Kidman and Urban did not immediately respond to Fox News Digital's request for comment.The Oscar-winning actress first met Urban in 2005 at an event in Australia. One year later, the couple married in Sydney.Urban previously spoke out about their approach to marriage and parenthood. In a 2023 interview with Fox News Digital, the country singer emphasized that no matter how chaotic life gets, their family was always a priority."It’s always family first," Urban said. "It’s balanced, so it means it goes out of balance sometimes, and we just put it back in balance. It’s never perfectly in balance, but we get it back on track."Before tying the knot with Urban, Kidman was married to actor Tom Cruise, whom she met on the set of Days of Thunder. The former couple adopted two children together — Isabella and Connor — before divorcing in 2001.