Hollywood actress Nicole Kidman has denied she is expecting her first child with husband Keith Urban.

The 40-year-old star and her musician partner were reported to have told their families over Christmas that they were having a baby.

But a spokesman for Kidman insists she is not pregnant, telling the Sunday Mirror, "As far as we are concerned it is another rumour."

The couple fuelled speculation they were planning to start a family together when Kidman announced she was hoping to "wind down" her film commitments next year. She also recently expressed her desire to have a baby with Urban.

The Golden Compass star already has two adopted children, Isabella, 14, and Conor, 12, with ex-husband Tom Cruise.