May 03, 2014 09:55 AM

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And baby makes four!

Russian supermodel Natalia Vodianova welcomed her first child with boyfriend Antoine Arnault on Friday, May 2, she announced on her Instagram.

“Last night at 2:45 a.m. was born our baby boy Maxim, living up to the definition of his name: he was born an incredible 4.2 kg (9 lbs., 2 oz.) and 55 cm (21.6 inches)!” the model mama, 32, writes, sharing a photo of her newborn’s foot.

“The baby and I are doing beautifully well to the delight of the proud daddy. Thank you for all your good wishes.”

The couple’s son joins Vodianova’s three children — Viktor, 6½, Neva, 8, and Lucas, 12 — from her previous relationship with Justin Portman.

The first-time father, the head of the luxury men’s footwear brand Berluti, announced they were expecting a baby together.

“Giving a little brother or sister to Natalia’s three wonderful children is something we wanted so much: AND NOW IT’S HAPPENING!” he posted to his Facebook in November.

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— Peter Mikelbank and Anya Leon

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