The TV presenter's fiancée Siri Pinter gave birth to their daughter London Rose on Wednesday, 20 August.
Little London joins big sister Etta, nearly two, and brother Jackson, five.
She weighed 8lbs 11oz.
The happy baby news was revealed on America's < em>Today show Twitter feed alongside a cute picture of Carson and his daughter. Carson hosts the digital studio on Today and The Voice US.
Carson later appeared on Today to share his excitement about the new arrival. He said Rose was his grandmother's name and they settled on the London Rose Daly moniker after the baby had been born and they'd met her.
Congrats to Carson and Siri!
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