"A beautiful little blessing has chosen me to be her mother," Campbell tweeted Tuesday. "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."
The 50-year-old shared a touching photo of her newborn's feet cradled in one of her hands.
Celebrities and fashion giants immediately took to Campbell's social media pages to congratulate her on the news.
"Oh my God!!!!! Today is the day?? How absolutely incredible. How lucky she is and how lucky you are!" designer Marc Jacobs responded. "What a wonderful Mother you will be. Blessings all around."
"Oh my goodness congrats lady! What a blessing!!!" actress Zoe Saldana wrote.
"Omg!! Congrats mama! Love you," Ryan Destiny commented on Instagram.
This is Campbell's first child.
In early 2020, the catwalker dished on her life in quarantine and shared just how she was spending the time at home in reflection.
"A very important thing is touch and we have to learn this lesson why this is happening," Campbell told Access Hollywood. "It's not just 'we are isolated.' We are isolated, but use this time to really soul-search and reflect why, and we cannot come out of this the same way."
She added: "We mustn't, we mustn't come out the same way."
The fashion icon also used Instagram to dish on how she was keeping positive while stuck inside.
"What can I say, we can't live in regret of 'we should have done this, we should have done that,'" the model explained. "We are where we are right now. We have to do the best to save lives and not lose any more people..."