The actress, who plays Jenna Marshall on the drama, welcomed a daughter called Phoenix Emmanuel Sursok-McEwen with husband Sean McEwen.
Little Phoenix weighed 9lbs 12oz, according to a rep, who broke the news to Us Weekly.
Tammin later confirmed her new arrival by tweeting a link to an online story, adding the caption: "Everyone is happy and healthy. A gift from God today. Pure love."
Sean tweeted: "Beyond blessed... What a day."
Among those sending congratulations to Tammin and Sean was Pretty Little Liars star Lucy Hale, who tweeted: "CONGRATS YOU TWO!!!"
Tammin, who previously appeared in Home and Away, married director Sean in an intimate ceremony in Florence, Italy in 2011.
Congrats to Tammin and Sean!
More stars who have welcomed babies in 2013 below!
Copyright: Love & Lust London