Britain’s Royal Mail has released ten special stamps in honour of Queen Elizabeth’s 90th Birthday, including a specially commissioned family portrait featuring four generations of the House of Windsor.

Photographer Randall Mackechnie took this photo of the Queen, the Prince of Wales, the Duke of Cambridge and a very cheeky Prince George in the White Drawing Room at Buckingham Palace during the summer of 2015.

This will be Prince George’s first time appearing on a British postage stamp, although he made his debut on Australian postage stamps in 2013 shortly after his birth.

Prince George stood on foam blocks so his face was level with his grandmother’s.

The perforations in the Stamp Sheet are positioned to create a postage stamp for each member of the Family.

Queen Elizabeth is now the oldest, but the second-longest reigning monarch in the world.

The longest-reigning monarch, Thailand’s King Bhumibol Adulyadej, aged 88, will be celebrating his Platinum Jubilee in June 2016.

The Queen became the longest-reigning monarch in British History on 9 September 2015, beating her great-great-grandmother Victoria’s record of 63 years and 216 days.

A further six stamps are also issued to mark this milestone, with three focusing on the Queen’s family life.

• The Queen with her father, George VI. (This is the first time Royal Mail have issued a stamp featuring father and daughter.)
• Attending the Opening of Parliament in 2012.
• with Prince Charles and Princess Anne in 1952

Three honour the Queen’s official duties.

• Visiting New Zealand in 1977.
• With Prince Philip, Duke of Edinburgh, in 1957.
• With South African President Nelson Mandela in 1996.

These stamps are available at post offices in the UK or online from 21 April. Visit Royal Mail’s HM The Queen’s 90th Birthday for more details.

On 20 April, the Queen and Prince Philip visited the Royal Mail Windsor delivery office to commemorate the 500th Anniversary of the Royal Mail postal service.

The Queen and the Duke met postal workers and was presented with a limited numbered edition of 90 framed sets with stamps which mark the Queen’s significant achievements for decades.

Australia Post has also released commemorative stamps celebrating the Queen’s 90th Birthday, which are available for a limited time.