The Sydney Morning Herald reports the baby's name as being Scout Heather Willesee.
The couple share two-year-old son, Mack.
Allison revealed the sex of her baby in November during an appearance on Nova 969's Fitzy and Wippa.
'Do you know what you're having?' Wippa' asked the 39-year-old, to which she replied: ''It's a little girl!'
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