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.

Kidman, 39, will wear a long white gown with Victorian-style high collar during the traditional Roman Catholic ceremony at an old Gothic chapel overlooking the sea in the Sydney suburb of Manly - a far cry from her Scientology-based nuptials with Tom Cruise in 1990, a union that ended in annulment five years ago.

The 200 guests who'll party under a huge white tent after the wedding include her adopted kids with Cruise, Isabella, 13, and Connor, 11; Meryl Streep, Julianne Moore, Russell Crowe, Naomi Watts, Hugh Jackman and Lachlan and Sarah Murdoch. Flying in separately are Renée Zellweger and Kenny Chesney, whose marriage only lasted seven months but whom we hear are quietly seeing each other again.

PG6