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.The 'That 70s Show' star said: "She's not pregnant. There was a rumour about a year ago, but it is not true.

"A baby could be in the plans. Everybody's adopting babies now, that's the new thing.

He added: "I feel like just having one would be weird. It's unconventional to have a baby just now, you've got to adopt one from Cambodia or something."