The star, 40, who plays Nicola King on the soap, gave birth to a baby boy last month but the news has only just been announced.
Nicola chose to keep her pregnancy under wraps, only confirming she was expecting eight months into her pregnancy.
A message posted on the official Emmerdale Twitter page at the weekend said: "BIG congratulations to @nicola_wheeler and her baby boy, who arrived on Friday 13! #Emmerdale"
Alongside the tweet was a picture of the blonde actress with the caption: "New mum!"
Nicola and her partner Matt have yet to announce the name of their newborn.
She had to keep her bump hidden in the popular ITV soap as she entered a storyline about a miscarriage.
Nicola has been temporarily written out of the soap to accommodate her maternity leave and her character has headed to Dubai for a new job.
Before she gave birth, Nicola thanked fans for their well wishes after announcing the news on Twitter, writing: "Thanks for all your congratulations still got a couple of weeks until (baby) arrives. Unless he/she gets impatient."
She continued: "Again thanks for all the baby congrats. He/she is a wriggler & currently auditioning for 'Aliens 5'. Great way to freak you other half out!"