The 32-year-old welcomed her fourth child, and first with boyfriend Antoine Arnault, in the early hours of Friday morning.
The Calvin Klein model proudly announced the news on her Instagram and Facebook pages by posting a heart-warming photo of her newborn baby son.
Natalia Vodianova gave birth to her fourth child
"Last night at 2.45am was born our baby boy Maxim, living up to the definition of his name: he was born an incredible 4.2kg and 55cm!" wrote Natalia next to the image.
"The baby and I are doing beautifully well to the delight of the proud Daddy. Thank you for all your good wishes, I would now like to pass them on to all women who are still expecting. Enjoy every minute of it."
The sweet snap shows Natalia and Antoine cradling their first child, who is dressed in a white and grey striped babygro and holding his foot up in the air.
Natalia and her French boyfriend, who is CEO of luxury men's shoe label Berluti, confirmed that they were dating in 2011 after they were pictured kissing on holiday in Ibiza. The blonde beauty had separated from her husband of nine years Justin Portman a few months before.
Natalia Vodianova and Antoine Arnault
When Natalia and Antoine found out that they were expecting their baby boy, the first-time father posted the exciting news on his Facebook page, writing, "Hi everyone, big news today! Giving a little brother or sister to Natalia's 3 wonderful children is something we wanted so much: AND NOW IT'S HAPPENING! :)))
"We're going to have out first baby next year!!! #4 for her but #1 for me… I'm a little stressed! She was tired the first 3 months but is fine now… I hope he or she gets Mommy's look (and beautiful heart!!!) and Daddy's sense of humour!! Pleaaaase not the other way round!!! :)))."
Natalia has three young children with British property heir Justin — Lucas, Neva and Viktor.