Kate Middleton's brother reacts as Prince William celebrates personal milestone

Princess Kate's brother, James Middleton, was prominent among those who reacted to Prince William's celebration of his 20 years as patron of a charity, which he took over from his late mother, Princess Diana

According to Kensington Palace, the Prince of Wales, on Tuesday visited the new offices of Centrepoint UK, a charity aiming to end youth homelessness. 

When the pictures of Prince William cutting the cake were shared on his Instagram account, the brother-in-law of the future king was prominent among those who reacted by liking the post.

During his London engagement today, William was not accompanied by James's sister, Princess Kate, who is in remission from cancer.

Centrepoint is one of William's longest patronages, having taken over from Diana, Princess of Wales, who became patron in 1992.

According to the charity's website, "Centrepoint is the UK's leading youth homelessness charity."

It says, "Alongside our partners, we support over 15,000 young people every year and campaign to end youth homelessness by 2037."