Judd uploaded a selfie of him and his wife to Instagram with Izzy holding her belly and making a heart shape with her hands.
The singer wrote: "Izzy and I are so happy and feel truly blessed to be able to share with you that we are expecting our very own little miracle #BabyJudd @izzyintheattic"
The announcement on 22 July was met with a large buzz of excitement from fans, with many writing their messages of congratulations in capitals.
One person wrote: "CONGRATULATIONS IM SO FREAKING EXCITED FOR YOU GUYS!"
And another wrote: " OMG !!! THANKYOU 💖💖 2016 HERE WE COMEEE!"
The couple's baby is due in January 2016 according to Hello! magazine.
Judd and his wife married in December 2012 and the singer recently revealed that having a child was the next step.
He told MailOnline on 4 July: "I'm happy at the moment but it's my main ambition. I'd like one sooner rather than later. I've got myself a wife so that's the first step."
This isn't the first McBusted baby, as bandmate Tom Fletcher and his wife Giovanna are proud parents to 16-month-old Buzz, and Matt Willis and his wife Emma also have two children - Isabelle, six, and Ace, three.