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As Nicole Kidman and soon-to-be-husband Keith Urban's secret wedding operations swiftly approach DEFCON 1, details have emerged regarding that most cherished of celebrity marriage traditions, the lowballing prenup. Says Page Six:

Kidman, who's worth about $150 million, has had her hubby-to-be ink a lowball prenup that guarantees him a kiss-off of just over $600,000 a year for every year they are together, according to press reports in Australia and England. In addition, there's a clause that allows her to bail without giving Urban, an ex-cocaine addict, a cent if he uses illegal narcotics or boozes excessively.

The agreement, signed in Los Angeles earlier this month, also calls for joint custody of any kids the couple has together, although Urban would be prohibited from taking them out of whatever country Kidman is living in, the London Daily Mail said.

Prenups are never less than a delicate affair: Their cold language and underlying sentiment—that a blessed coming together of two status-mismatched souls might one day be no more—inavariably puts a damper on the couple's happy day, and can also plant a seed of acrimony in the mind of the lesser signee. From now on, every time Urban leans over a mirror with a rolled dollar bill in his hand, not only will he have to recall the exact terms and amounts specified in the Excessive Cokey-Boozey Clause, but he'll also be reminded that two thirds of that straw belongs to his wife. It's resentments like these that can quickly loosen the bonds of a solid marriage.