Princess Margaret’s grandsons are the hottest royals around

If there are two British royals worth following on social media, it's Samuel and Arthur Chatto, the grandsons of Princess Margaret. The boys are all grown up and if their Instagram accounts are anything to go by, are very, very fit.

Samuel, 21, and Arthur, 18, are the grandchildren of the Queen's late sister Princess Margaret and her ex-husband Antony Armstrong-Jones, the 1st Earl of Snowdon. While Samuel's profile shows an interest in yoga and travel, Arthur's shows a preference for Calvin Klein boxer shorts and weight training.

Samuel rarely shares photos with the public, with his most recent post from May 2017.

Arthur's shares photos more regularly, with his latest a military-style workout in Sussex, complete with camo-pants and large handweights.

Samuel is 22nd in line to the throne and Arthur 23rd. Their mother Lady Sarah Chatto is a lesser-known member of the royal family, the daughter of Princess Margaret and 21st in line to the throne. She is also the Queen's only niece.

Married to Daniel Chatto, Lady Sarah recently appeared in the BBC documentary Elizabeth at 90: A Family Tribute.

Arthur shared this photo of his parents on their wedding day on his Instagram account.