The future king is likely to spend the weekend celebrating his big day with his parents the Duke and Duchess of Cambridge.

But according to reports the party may be taking place in the Caribbean, as William and Kate are rumoured to have taken their children on a summer break to the exclusive island of Mustique.

George has made a number of eventful public appearances over the past 12 months, from starting school to a cheeky moment on Buckingham Palace's balcony, as the royal family celebrated the Queen's official birthday.

But he can sometimes appear a little shy and reluctant in front of the cameras - understandable for a young boy who is slowly getting to grips with life in the limelight.

Prince George Alexander Louis of Cambridge was born at the private maternity unit of St Mary's Hospital, Paddington on July 22, 2013.

He made his public debut in front of the world's media on the hospital steps one day later, wrapped in a white merino wool shawl, cradled in his proud parents' arms.

A great-grandchild to the Queen, he will be the 43rd monarch since William the Conqueror obtained the crown of England if, as expected, his reign follows those of the Prince of Wales, then William.

A few months after his last birthday George started his first day at school with his father, but without his mother, Kate. She was experiencing severe morning sickness as she was pregnant with Prince Louis.

The youngster has just completed his first year at school, attending Thomas's Battersea in south London.

He even played a sheep in his school's Christmas nativity play, and loves helicopters, flying and is obsessed with all things police-related.

George was last seen at the christening of his baby brother Louis at the Chapel Royal at St James's Palace on July 9, and in official photos marking the royal baptism.

Australian Associated Press