Ashton Kutcher is so desperate for a baby he reportedly jetted across the US to wife Demi Moore when he heard she was ovulating.

The 'Punk'd' star allegedly decided he couldn't be away from the actress - who has three daughters from her marriage to Bruce Willis - while she was at her most fertile.

Kutcher is said to have flown to join Moore in Louisiana, where she is shooting her new movie.

America's Star magazine reported: "Demi Moore was ovulating - and he rushed to Louisiana, where she is filming 'Mr Brooks', to be by her side."

However, Kutcher's representative has denied the story.

Last month the couple - who tied the knot in September last year (05) - rubbished rumours they were expecting a baby but admitted they may consider adoption.