The TV presenter and her husband Trent Miller welcomed their first child, Ruby May Miller, on Thursday night.
Their friend Ben Fordham announced the news on the Today show on Friday morning, saying the parents were overjoyed.
“Little baby girl Ruby May Miller was born last night. She weighed 7.5 pounds [3.4kg] and is absolutely beautiful. Mum and baby are fantastic and dad is pretty happy too,” he said.