On the eight birthday of their son Prince George, Prince William and Kate Middleton crossed 13 million followers.
The Duke and Duchess of Cambridge follow only 113 people on the Facebook-owned social media app.
They have amassed 13 million followers by sharing only 2338 posts on the photo and video sharing application.
The royal couple recently launched their YouTube channel "Duke and Duchess of Cambridge" where they have half a million subscribers.
Meghan Markle, Prince Harry give 'major sign' about their UK plans
The original 1980s hit comedy follows a story of three female colleagues who take revenge on sexist boss
Prince William shares Princess Charlotte's joke during latest outing
Liuzzo was found dead in Miami in February
Prince William wins hearts with his latest move
Meghan Markle recently faced a major business setback