Nicole Kidman

Actress Nicole Kidman has rejected a report she is pregnant after arriving in Sydney with husband Keith Urban, ahead of starting work on the Baz Luhrmann feature film Australia.

London's News of the World website is reporting the pregnancy after Kidman was seen outside the same California clinic where former Spice Girl, Mel B, gave birth last week.

Kidman and her New Zealand-born country singer husband Urban, both aged 39, were said in the report to be delighted with the news, less than a year after marrying.

The couple arrived in Sydney today, but gave no indication they were expecting a child.

She told reporters outside her harbourside mansion that it was "really good" to be home.

The Oscar winner was not asked about being pregnant before leaving with Urban to have lunch and celebrate Easter with her family in Sydney.

But speaking through her publicist Wendy Day, Kidman said the report was "incorrect".

"As if she would confirm a pregnancy to News of the World," Ms Day said.

Kidman starts work on Tuesday with Australian director Baz Luhrmann on his romantic adventure epic, Australia.

She'll be in the country for up to eight months, filming with co-star Hugh Jackman at locations in far-north Queensland, Darwin, Western Australia and Sydney.

"It's really good, really good, exciting about the film too," Kidman told reporters when asked how it felt to be back home.

The last time she spent so much time in Australia was to film Luhrmann's Moulin Rouge! - the last movie she made in the country.

Urban is due to start a concert tour of Australia next month.

Kidman has two children, Isabella and Connor, who she adopted with her former husband, actor Tom Cruise.