The former Dr Who star, 25, admitted: "I'm terribly broody.
"I haven't always been because I've two sisters and a brother, they're a lot younger than me and I took care of them a lot.
"But back then I thought, 'I can't imagine having a child'. Now I really can. I can feel it, it's strange."
Billie will marry actor Laurence, 29, this year and says they will have to curb their work schedules.
She told the Radio Times: "The hardest thing about us both being actors is that it's not just an eight-hour day, it's your life for however long you're shooting.
"I don't know that you can both do it all the time or you'd never see each other."..Celebs and Bubs
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This season rating's have dropped....Have you been tuning into this season of Grey's Anatomy?
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