Claire Cooper and Emmett J Scanlan have named their son Ocean-Torin Scanlan.
Emmett, 41 - who also has a daughter, Kayla, from a previous relationship - took to Twitter and Instagram to share a sweet black-and-white snap of the newborn and wrote: "Hey world, meet my world. Our world. Meet Ocean-Torin Scanlan."
And his and Claire's celebrity pals were quick to offer their congratulations.
Eoin Macken wrote: "He already looks suspiciously handsome and chill."
Keith Duffy - whose son Jay played Emmett's son on 'Hollyoaks' - quipped: "Congratulations what great news. Hope @jayduffy doesn't get jealous."
Roma Downey posted: "Baby ocean is gorgeous , welcome to the world little one," Anna Friel wrote, "Soooooo beautiful" and 'Derry Girls' writer Lisa McGee said: "Very very very cute."
Meanwhile, Claire, 39, recently admitted she still has to "pinch herself" that she is a mum.
She wrote on Instagram: "And just like that I became a mamily. After 2 trips to the hospital, 40 hrs of labour & an emergency C section our little boy arrived
"So grateful to the entire team who supported us in all our choices at #arroweparkhospital before, during & after - it certainly got complicated in moments but then he's a wee Scanlan how are we surprised?! the #NHS team led us consistently with care & kindness & made us feel so safe & protected - thank you!!
"Finally a huge thank you to our Doula Jemma @the_hypnobirthing_doula_ who kept us so strong throughout, talked endlessly with me, always giving us the opportunity to discuss all our options & being the support we so needed
"Now I must go pinch myself - we made a tiny human (sic)"
The couple met on 'Hollyoaks' with Claire starring as Jacqui McQueen from 2006 to 2013, while Emmett appeared as Brendan Brady from 2010 to 2013.
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