Nicole Kidman is walking on eggshells around estranged husband Keith Urban , desperate to keep the peace as she faces fears that a messy divorce could jeopardize the fortune she's earned over decades in Hollywood, sources tell RadarOnline.com .

The Moulin Rouge! actress, 58, filed for divorce from the country star , 57, this month after 19 years of marriage. Article continues below advertisement

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Court documents filed in Nashville on Tuesday, September 30, revealed the pair had quietly signed a parenting plan weeks earlier, agreeing not to disparage each other around their daughters, Sunday, 17, and Faith, 14.

The doc

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