The supermodel revealed the news in an Instagram photo, showing herself cradling the newborn’s feet in her hands.
She wrote: “A beautiful little blessing has chosen me to be her mother. So honoured to have this gentle soul in my life there are no words to describe the lifelong bond that I now share with you my angel.”
Naomi – who will be celebrating her 51st birthday later this week – added: “There is no greater love.”
Naomi offered no other information on the new arrival but did tag her own mother, Valerie Morris-Campbell, in the post.
The baby is Naomi’s first, with the legendary model having shared her hopes to have a family on numerous occasions in the past.