The actor and his wife Sara Wells welcomed their first child together on Monday, 22 June, a daughter named Frances Harper.
Noah is also dad to son Owen, 12, and daughter Auden, 9, from a previous marriage.
The 44-year-old actor became a household name thanks to his role as Dr John Carter in medical drama ER alongside George Clooney.
At one stage he was the highest paid actor on TV.
More recently he's been starring in post-apocalyptic drama Falling Skies.
Congrats to Noah and Sara!
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