"A beautiful little blessing has chosen me to be her mother," She wrote this next to a photo of her hand cradling a tiny pair of infant's feet.
She continued, ’’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. There is no greater love.’’
She had previously expressed interest in having children, telling the Evening Standard magazine in 2017 that "I think about having children all the time."
But she added, "with the way science is I think I can do it when I want."
Celebrities were quick to express their congratulations.
Marc Jacobs, the designer, wrote on Instagram, "Oh my God!!!!! Today is the day?? How absolutely incredible. How lucky she is and how lucky you are! What a wonderful Mother you will be. Blessings all around"
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Actress Zoe Saldana said, "oh my goodness congrats lady! What a blessing!!!"
Campbell also commented on YouTube, where she has her own channel.
"Such beautiful news, massive congratulations Naomi," the video-sharing site's official Instagram account said.
In between charity and NGO work, particularly in Africa, and reality TV appearances, the jet-setting, boundary-breaking model still poses for magazine covers.
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When asked about children in 2019, she told in an exclusive interview, "Not yet — I'll see what the universe brings me."