Nicole Kidman revealed the secret to her “successful marriage” with her estranged husband, Keith Urban, months before they pulled the plug on their relationship.

“We have a double shower,” the “Big Little Lies” star cheekily told W magazine in January.

“The double-headed shower: key to a successful marriage.”

Kidman, 58, emphasized that “separate commodes” in their primary bathroom were also helpful.

The actress and Urban, 57, are no longer sharing the same bathroom, with Page Six confirming Tuesday that they had parted ways after 19 years of marriage.

“Sometimes relationships just run their course,” an insider told us.

We’re told Kidman “did not want the separation and was trying to save things,” and that she feels “betrayed.”

Additional insiders told TMZ that the exes had bee

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