Oscar-winning actress Nicole Kidman said on Saturday she planned to get a good night's sleep before Sunday's wedding to country singer Keith Urban in Sydney, while Urban is reportedly having a buck's night out.

Australian actor Nicole Kidman (R) is driven away from her Sydney house June 24, 2006. [Reuters]

As preparations for the wedding were finalised, Sydney media speculated that "Moulin Rouge" director Baz Luhrmann, a long-time friend of Kidman's, would shoot the wedding video.

Kidman and Urban are to be married on Sunday but details of the wedding have been kept under wraps all week as guests such as King Kong star Naomi Watts and Luhrmann jetted into Sydney.

Speaking briefly on Saturday, Kidman said she and her husband-to-be were "very happy".

Asked what she would be doing on Saturday night, Kidman replied: "I'm going to get some sleep".

Urban is reportedly having a buck's night at an exclusive Sydney nightclub with musicians who have flown in from Nashville.

Luhrmann, who will attend the wedding with his film producer wife Catherine Martin, met Kidman and Urban on Friday night, sparking media speculation he would be involved in "creative direction", which would include the wedding video.

"I am very happy to be going along to a happy occasion," was all a smiling Luhrmann would say to reporters after meeting the couple and the wedding party at Kidman's family home in Sydney. Kidman told reporters that Luhrmann was "part of the family".

Luhrmann chose the statuesque Australian actress to star in "Moulin Rouge", and directed her in a Chanel No 5 advertisement.

Sunday's wedding is expected to take place at the Cardinal Cerretti Memorial Chapel, a gothic-style sandstone church inside an old Catholic seminary overlooking Manly Beach.

While the location is secret, a big marquee erected near the chapel seemed to be a dead give-away, along with the fact that Catholic priest Paul Coleman, who will conduct the service, comes from a parish a few suburbs away.

"To Nicole & Keith, congratulations from the boys at St Paul's", read a sign outside a school opposite the chapel.

Kidman, who won a 2002 Academy Award for her role in "The Hours", went through a very public divorce from actor Tom Cruise in 2001 after a 10-year marriage. But the couple have remained friends, sharing custody of their two adopted children.

Kidman and Urban, both Australians but born overseas, met in January 2005 at an awards dinner held by the Australian government in Los Angeles honouring the two of them.

On Monday they arrived in Sydney saying they were to marry, sparking a paparazzi frenzy, with Kidman providing a photographic opportunity each day.

Urban has also been happy to be seen around Sydney, mingling with World Cup fans on Friday morning to watch television coverage of Australia's showdown with Croatia.

No wedding details have been leaked, with reports those involved have signed confidentiality agreements.

"Nicole and Keith just want a normal wedding and to celebrate with their friends and family," Urban's manager, Rob Potts, told reporters on Saturday.

The Sydney Morning Herald society column "Private Sydney" reported on Saturday that French fashion house Balenciaga has designed the bridal gown, which features high collars.

"White on white, with a splash of pink" is the theme of the wedding, it said. Kidman's children, Isabella, 13, and Connor, 11, are believed to be bridesmaid and usher.