Maddy and her partner Tom announced that they were expecting back in May, and now an Instagram post has confirmed the birth.
"Welcome to the world Shelby Rae, love you so much already," read the photo caption, alongside pictures of Maddy in bed cradling the newborn, who wears a knitted purple hat, with Tom at the bedside.
A follow-up video showed Maddy talking to her baby, saying that she looked "very purple" in her getup.
"Aren't you gorgeous?" she added.
"Shelby Rae our little girl – feel so lucky," she wrote in the caption, adding that the baby was born on Saturday, September 23, and weighed 6lb 3oz.
The Traitors host Claudia Winkleman and fellow contestants Theo Mayne and Faye Greaves were among those who wrote congratulatory messages for Maddy and Tom in the comments section of her post.
Maddy is currently starring in Hollyoaks as Faye Fuller, a talent agent who is meant to be working with influencer Rayne Royce but who actually prefers working with Lizzie Chen-Williams, much to Rayne's ire.
This week's episodes will see a major twist in the Rayne story, kicking off not only a brand-new mystery for the soap, but also the new era of Hollyoaks where episodes premiere on the Channel 4 streaming service first, air on E4 the next day, and come to YouTube a week later.
Maddy previously stated that her time on The Traitors gave her confidence to do better in her acting auditions, stating: "It did make me realise as well that I'm not dying or I'm not on death row – which is how it felt when I was in there.
"I suppose it's made me a bit more of a go-getter and you only live once!"
The Traitors series 1 is available to watch now on BBC iPlayer.
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