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The couple married in Australia in 2006. Their breakup surprised many fans.

By Claire Moses and Neil Vigdor

Nicole Kidman, the Oscar-winning actress, filed for divorce on Tuesday from her Grammy-winning singer husband, Keith Urban, after nearly 20 years of marriage, according to court records.

In a filing in circuit court in Davidson County, Tenn., in Nashville, where the entertainment power couple have lived, Ms. Kidman, 58, cited irreconcilable differences in her request to end the marriage.