But Her Majesty The Queen seemed to enjoy former Labour MP and Strictly Come Dancing star Ed Balls giving an unusual stage performance - even if it left the Twittersphere slightly bemused.
The event is a break in tradition for the queen who usually spends her birthday privately with little public celebration, although there were nationwide events to mark her 90th.
Charles, who is second in line to the throne and celebrates his seventieth birthday later this year, was described as a demanding boss by a source claiming to close to palace staff.
I mean, OK, she is his mother, but still - who calls their mum "Mummy" anyway? Prince Harry is now the president of the trust, and he spoke at his grandmother's birthday celebration, announcing that the trust will work to make a difference in communities across 53 countries.
He said: "I have a feeling that in 1948, when you were 22, you didn't somehow expect that at the age of your 92nd birthday, to find your son in his 70th year".
Queen Elizabeth turned 92 on Saturday.
During the meeting, the Queen made a remark about her preferred successor as the head of the Commonwealth.
Elizabeth also has an "official" birthday in June, which is marked with a large parade of soldiers through central London, known as Trooping the Color.