AceShowbiz -

Demi Moore and Ashton Kutcher's marriage is allegedly under pressure because of their failure to have a baby. The 44-year-old actress already has three daughters with ex-husband Bruce Willis, but she and 29-year-old Ashton are keen to have a child of their own.

A source told America's Star magazine: "Demi seems very controlling. She likes to tell Ashton what to do, stand here, meet this person, do that. She wears the pants in that relationship. Ashton desperately wants a baby but is having to cope with the possibility that Demi may never bear his child."

Demi has been making a number of sacrifices and lifestyle changes to enhance her chances of conceiving - and is reportedly expecting Ashton to do the same. The couple attended a party at a producer friend's Bel Air home in March and Demi was said to be furious when her younger spouse drank alcohol.

A witness said: "Ashton accepted a glass of champagne, after Demi refused the offer. She shot Ashton a look that said 'I'm not drinking, so you shouldn't either.' Ashton gave her a defiant look that appeared to say he didn't care, and he took a sip."

"She doesn't want him to do anything unhealthy because of their difficulty in trying to have a baby together. The bottom line is Demi and Ashton love each other. But it's tough going right now!"

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