Prince George's photo helps Kate Middleton, Prince William hit 13 million followers on Instagram

A picture of Prince William and Kate Middleton's son  has been liked by more than 1.3 million people on Instagram.

The royal couple had posted a picture of Prince  George on their Instagram account a day before his birthday.

It was one of the few posts shared by the royal couple that crossed one million likes on the app.

Prince William and Kate Middleton recently celebrated eight birthday of their son Prince George.

The Duke and Duchess of Cambridge also crossed 13 million followers on the photo and video sharing app on the birthday of their son.