The couple and co-stars announced their happy baby news via Twitter last night (2 June).
Charley shared a photo of herself, Matthew and their son Buster, captioning the snap: "Here we go again #babynumber2."
In the adorable family photo, Buster poses behind a sign, which reads: "Only child expiring: December 2015", while Matthew holds up the sign: "baby #2."
The couple were inundated with well wishes from fans and their Emmerdale co-stars.
Matthew later thanked everyone for their messages, saying: "Wow.... Overwhelmed by all the congrats tweets!! Thank you so much we are sooooooo excited!!"
Matthew, who plays David Metcalfe in the ITV soap, first started dating Charley (Debbie Dingle) in 2008. They got engaged, but split in 2013, however they later reunited.
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