Hilary Duff has been singing to her unborn baby but is worried he doesn't like it.

The American star and her husband Mike Comrie are expecting their first child together and had announced the tot is a boy.

Hilary can't wait to be a mom and is keen for her son to be proud of her. She wants to get back into the recording studio soon and so has been having vocal coaching.

"I've been taking vocal lessons so he hears me sing," she explained. "But it's warm-ups, so I don't know if he likes it!"

Hilary and Mike have already chosen a name for their son but are keeping it under wraps at the moment.

She has also been having fun getting their home ready for the new arrival. The 24-year-old has decorated the nursery already and decided to go for an eco-friendly theme.

She chose a bed which is environmentally friendly and has picked wallpaper with animals emblazoned on it.