The Mirror report the 35-year-old actress and her boyfriend Johnny Lloyd are ecstatic about the news.
Billie and Tribes frontman Johnny have been dating for two years.
A friend told the publication: “They can’t wait to welcome the new addition to their family.”
The Sun Online has contacted Billie's representatives for comment.
Billie is already mum to two sons, Winston, nine, and Eugene, six, from her marriage to Laurence Fox.
The former Dr Who star has made no secret of her desire to have a big family.
In February she said of having more kids: “In my dream world I’d have loads.
“I was one of four and it’s taxing for both parents and kids. I do like the idea of chaos.”
Billie shot to fame at the age of 15 as a pop star when her debut single Because We Want To topped the charts.
The single was followed by Billie's album Honey to the B which was certified double platinum.
But by 2003, aged just 20, she retired from the recording industry and launched an acting career.
The star first married Radio 2 star Chris Evans in a secret ceremony in Las Vegas in May 2001, after six months of dating.
Although they divorced in 2007, the pair have remained close friends.
Her marriage to Laurence was more rocky, and after seven years the pair parted ways.
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