British actress Minnie Driver is determined not to find out the sex of her unborn baby - so she has an extra incentive during delivery.

The Good Will Hunting star believes not knowing whether her child is a boy or a girl will give her an added interest in the labour.

She says, "I'm old school, I don't wanna know. I think you need some incentive through labour, I think you need as much encouragement as possible."

But she's sure of one thing - she's determined to have a natural birth.

Driver, who is five months pregnant with her first child, says,"I'd really like to avoid (a caesarian). I don't want that. I'm squeamish and I just wanna do it like women have been doing it for thousands of, millions of years."