Kate Middleton's brother reacts to Prince William's post about George

James Middleton has dropped a meaningful comment after Prince William and Princess Kate released iconic photos of their eldest son Prince George on his milestone day.

Princess Kate's brother shared a public message of support for his 13-year-old nephew as he embarked on a new journey in his life.

The Prince and Princess of Wales celebrated the moment on their official Instagram account, sharing his first photographs from the college.

The pictures attracted massive reastions from fans, with James Middleton also shring his words for the yong royal and their proud parents.

He wrote below the snaps: "Big day," alongside a love heart emoji.

James knows his sister and brother-in-law will be feeling emotional due to this mammoth milestone.

Some royal fans pointed out how much George resembles the Middleton side of the family. "Very much can see you and Mike in George!" one replied to James, Mike being Michael Middleton, James' father.

Another agreed: "He is a Middleton for sure! Looks like you and your father." Others pointed out he was a "blend" of both William and Kate. "Such a lovely mix of both William and Catherine!" was among the comments.

The school's traditional uniform consists of a tailcoat, winged collar, and white tie, a look that's become instantly recognisable. The young royal follows in the footsteps of his father, Prince William, who enrolled at the Windsor-based institution 31 years ago.