Adam Thomas, 27, and Caroline Daly announced their happy news on Twitter on Monday night.
Adam said: “2day I fell more in love with @Carolinejanexx than I ever will do! Teddy James Thomas born 8/9/2014 new lucky roulette numbers right there.”
He later joked: "Dear god please stop this baby from crying!!!!"
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Teddy, derived from the name Theodore, means "gift of God", according to baby name website Nameberry.co.uk.
And, judging by the photo Adam posted of himself and his little boy on Instagram, it's a gift that he is definitely enjoying.
The snapshot, which can be seen at the top of the page, was captioned: “Nobody said it would feel this good #TeddyJamesThomas #fathersson #myboy.”
Adam isn't the only one excited by his new arrival – his brother Ryan Thomas, who plays Jason Grimshaw in Coronation Street - also looked pleased as punch to be an uncle to baby Teddy.
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In a touching close-up photo showing Ryan planting a kiss on his baby nephew, he said: "I'm an uncle!!!! #TeddyJamesThomas."
Adam’s former Waterloo Road co-star Chelsee Healey was also quick to congratulate the new parents, writing: “So happy for you both, hope the beautiful baby is well and healthy as you Cazza boo! X”
And Emmerdale co-star Danny Miller said: “So proud of you! You and @carolinejanexx are gonna be great! See you later for a cuddle.”
Adam, who plays Emmerdale’s Adam Barton, and Caroline, who runs her own dance school ABCD Dance in Altrincham, have been in a relationship for six years.
Congratulations to the happy family!