Keith Urban holds his Grammy award for Best Male Country Vocal Performance in this Wednesday, Feb. 8, 2006 file photo, in Los Angeles. Urban is country music's sexiest man, according to a reader poll to be released Friday, June 16, 2006 in Country Weekly. [AP Photo]

The other possible venue could be the much larger and more private St Patrick's Catholic church overlooking Sydney's Manly Beach, reported Australian Associated Press.

Kidman, a goodwill ambassador for the United Nations Development Fund for Women, ended her 10-year marriage to Tom Cruise in 2001. The couple have two adopted children.

Kidman and Urban met in January 2005 at an awards dinner held by the Australian government in Los Angeles honouring the two of them.

Kidman, who won an Academy Award for her role in the 2002 film "The Hours," was born in Hawaii but brought up in Australia.

Urban, a singer and guitarist, was born in New Zealand and grew up in Australia. He won a Grammy in 2005 for best male country vocal performance on the song "You'll Think of Me".

During her marriage to Cruise, Kidman was introduced to scientology. But Father Coleman, who advised on Kidman's marriage annulment, said the upcoming marriage to Urban showed that scientology had not undermined her Catholic faith.

"For Nicole, you know this is a spiritual homecoming, coming back to the church and her faith in her old parish," Coleman told Catholic News Service earlier this month.

The lack of a confirmation has not stopped a frenzy in the Australian media, with weekend newspapers reporting that guests had been sworn to secrecy and speculating on what kind of gown Kidman would wear.

Guests will reportedly include fellow stars Naomi Watts, Russell Crowe and Hugh Jackman, director Baz Luhrmann, and News Corp. Ltd. boss Rupert Murdoch and his wife Wendi Deng.