Meghan Markle posted the picture on the House of Sussex's official Instagram page on Sunday afternoon.
It shows the Duchess's hand cradling the tiny bare feet of baby Archie, who was born six days ago.
It is thought the photo was taken at Frogmore Cottage, the Sussex’s Windsor home in the grounds of Windor Castle.
Princess Diana's favourite flower - forget me nots - can be seen in the background. The 37-year-old also took the time to pay a tribute to mothers across the word.
"Paying tribute to all mothers today - past, present, mothers-to-be, and those lost but forever remembered," the royal wrote.
"We honor and celebrate each and every one of you.