The Big Brother host and Busted musician husband Matt Willis will welcome a new arrival to their family next year.
They're already parents to daughter Isabelle and son Ace.
Emma confirmed the news via Twitter by thanking followers who wished her well. It's thought she recently had her three month scan and began telling family and friend, with a source telling The Sun: "Emma and Matt are thrilled. It's something they've been talking about for some time."
The couple married seven years ago, with Emma recently gushing about Matt in an interview with Cosmopolitan, saying: He's a constant support with everything. When I thought about sacking it all off, he was like, 'Don't be ridiculous, just stick with it.' It's everything about him: he's an incredible person."
It's shaping up to be a busy year for both Emma and Matt. As well as the new baby and two young children, Emma returns to our TV screens in January for the new series of Celebrity Big Brother, while Matt is working with Busted following Charlie Simpson's return to the band.