The Canadian stars took to social media to share the news on Thursday, September 12, revealing Italia had given birth to a healthy baby boy.
"Today we welcome Robert Amell V into the world but also find out that being triple extra pregnant increases your odds of birthing Gollum," the "Designated Survivor" actress quipped in a Twitter message, attached to an image of the baby's wrinkled fingers curled around his mum's hand.
Proud dad Robbie also took to social media to announce the news, sharing a close-up photo of himself with the newborn, who was wrapped in a blanket and wearing sunglasses.
Italia tells ET Online she is recuperating comfortably, adding, "We are definitely resting well and eating all of the things I wasn't allowed when pregnant," she shared.
Italia married Robbie in 2016.