Natalia Vodianova gave birth to fourth son Maxim just a month ago, but she's already back to posing for supermodel-worthy photos.

This morning, the 32-year-old mother-of-four posted a beautiful intimate black-and-white photograph to Instagram, which shows her breastfeeding her son in the nude.

She dedicated the image to her billionaire husband Antoine Arnault for his birthday.

The supermodel captioned the shot: "happy birthday baby from Paolo, Maxim and I. Love you @antoinearnault S))))"

She later revealed that Paolo refers to Paolo Roversi, the Italian fashion photographer who apparently took the mother-son picture.

Posting a photograph of the two of them together, she wrote: "Paolo was one of the first to photograph me all the way back in 2001 #friendshipforlife"

Unsurprisingly, Natalia's followers were quick to praise the photograph, one writing: "my all time fav model and her baby. Cute picture huh!! [sic]"

Another added: "aww this is precious! [sic]"

Natalia is not the only one to post a breastfeeding selfie; there has actually been a significant rise in nursing selfies on the social media site over the past few weeks.

And, while Instagram says officially that breastfeeding photos are permitted, some moms have run into trouble after posting intimate nursing images.

Heather Bays, a photographer and Toronto-based mother-of-two, saw her Instagram account summarily shut down, just a few minutes, she says, after she received a negative comment about a black-and-white photograph that showed her nursing her 20-month-old daughter, reported TheGlobeAndMail.com.

Instagram’s security measures kick in, a spokesperson for the app explained, when the site receives a number of complaints in a short time - and when questionable photos involve children, the site errs on the side of caution and quickly shuts down an account.

What do you think of Natalia's breastfeeding selfie?