Funnyman Ashton Kutcher is contemplating adopting a child with his wife, actress Demi Moore.

The 30-year-old is stepfather to Rumer, 19, Scout, 16, and Tallulah, 14 - Moore's daughters with action star Bruce Willis - and the actor insists he dreams of "someday" expanding their brood with children of his own.

But the Hollywood heartthrob admits he hasn't ruled out adoption, since he has always been drawn to the idea of taking in an orphaned child.

He says, "I have thought about adopting a kid my whole life. When I was eight I had a friend called Terry and one day he told me he was adopted.

"He said his parents told him there was a more special bond between them because they picked him. I thought that was pretty profound and I would be open to the idea."