Helena Bonham Carter is desperate to add to her family with director lover Tim Burton, but fears she's too old for more children.

The birth of son Billy Ray in 2003 changed the actress' life and she'd love to give him a brother or sister if it's not too late.

Bonham Carter says, "I would like another if I get lucky. I'm 39 now, so the odds aren't great.

"I actually like being a mother. Mothers are great."