The singer announced the happy news on Twitter and Facebook to her fans: 'I am having another baby. Due in Spring. A little brother or sister for Sonny and Kit. Family e-b-jones are happy and excited.'
She added: 'It's a lovely thing. (By the way, work on album 5 continues as usual. In fact, I now have a deadline! In the studio as we speak.)
Sophie, 32, is married to bassist Richard Jones. Both their children Sonny, now seven, and Kit, two, were born prematurely - Kit weighed just 2lbs 10oz when he arrived nine weeks early, and Sonny was born by emergency C-section after Sophie developed pre-eclampsia. Let's hope this pregnancy and birth go to plan.
We recently interviewed Sophie's mum, former Blue Peter presenter, Janet Ellis about the joys of being a grandmother. Looks like she's going to a be a whole lot busier. You can read the interview here.