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Published 10:28 21 Jul 2017 BST

His arrival was confirmed by People on Thursday.
Joseph and Tasha, who married in 2014, are really private when it comes to family - and have never even confirmed their eldest's name.
In a 2015 interview, the 36-year-old actor said: "My son, he's just a baby, you know?
"He hasn't made the choice to be in the public eye, and that's a choice that I would like him to be able to make when he's older, when he can think about these kinds of things and make that decision for himself.
"And so, for now, I'm just a protective dad, and I want to protect his privacy."
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