Clarence House also released several other adorable stamps featuring Prince Charles and the other members of the royal family.
Meanwhile Prince Philip, who retired from royal duties in 2017, is still popular.
In the front row, Prince Charles bounces Prince George on his lap as he sits next to Camilla and Princess Charlotte. British Prime Minister Theresa May also attended, as did the German President Frank-Walter Steinmeier.
Happy birthday Your Royal Highness.
The Queen was joined on the balcony of the Foreign and Commonwealth Office building by her daughter-in-law, Camilla, Duchess of Cornwall, and Catherine, Duchess of Cambridge.
Putin says had good conversation with Trump
The Paris Peace Forum aims at promoting concrete actions toward peace and should be repeated every year, he said. Macron suggested that European corporations and entities were deeply dependent on the USA dollar.
The Duchess of Sussex - 55%.
Speaking in Prince, Son and Heir: Charles at 70, the Duke of Cambridge said: "Now he's reached his 70th year it's a flawless time to consolidate a little bit because, as most families would do, you are anxious about having them around and making sure their health's OK - and he's the fittest man I know but equally I want him to be fit until he's 95".
Not sure that it is pleasing to Queen Elizabeth II, who would have disputed with Prince Harry before his wedding with Meghan Markle... Or even more surprising, when the Queen finishes her dinner, it's everyone else who should stop eating! He's already rocking shorts just like his big brother George (most royal boys wear shorts and knee socks until they are eight or so and then they start wearing trousers!) Charlotte looks adorable as ever, smiling for the camera, but also possibly eyeing something behind the camera that she wants to play with.
The day will conclude with a Service of Thanksgiving at Westminster Abbey which will give thanks for peace and the return of the many servicemen who came back to their families.