The actress and her hubby Laurence Fox have been telling close pals how excited they are about having a brother for their three-year-old son Winston.
A pal said: "They decided to find out the sex and it's a boy.
"They are delighted but just as happy as they would have been for a girl. They think it's great that Winston will have another boy to play with."
Billie, 29, star of the raunchy TV drama Secret Diary of A Call Girl, is due in early spring.
She and actor Laurence, who played DS James Hathaway in the TV detective series Lewis, married in 2007.
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