Arthur, the son of Lady Sarah Chatto, the only daughter of the late Princess Margaret, and grandnephew of Queen Elizabeth II, took to Instagram on Monday to share a selfie he took while posing in front of his mirror in a tight white T-shirt.
The teen, who is 23rd in line to the throne, captioned the black-and-white photo: 'You should not be able to see my nipple,' which is likely a reference to his recent posts where he’s not-so-covered up.
Earlier in the year the royal posted a photo showing himself in nothing but a pair of white Calvin Klein underwear, captioned, '#Chatnoleg.'
Much like his cousin Prince Harry, Arthur is on a military career-path. He graduated earlier this year from the Combined Cadet Force at Eton, and is now attending Edinburgh University like his older brother.