The late Princess of Wales had a close relationship with Queen Elizabeth, even after her divorce to Prince Charles.
Several royals have a nickname for Her Majesty when they are not in public.
Prince William and Prince Harry privately referred to the Queen as Granny, yet in public, the official line is Her Majesty.
Her great-grandchildren call her Gan-Gan.
However, it has been revealed even Diana recognised her close relationship with The Queen with a nickname of her own.
It has been said that Diana referred to Charles’ mother as Mama, a nickname also used by The Queen’s other daughters-in-law in private company.
Sophie Countess of Wessex, Prince Edward’s wife, adopts the same moniker for the Queen.
The Cambridge’s children also have cute monikers.
Prince George is known as PG, whilst his sister, Princess Charlotte, is often called ‘poppet’.
The children are said to refer to their dad similarly.
The Cambridge youngsters call their dad ‘pops’.
Fiona Sturgess, a fan of the royals, revealed to reporters how the family use the nickname.
She told reporters: “Kate said that William was playing football with the children last night and one of them said, I think it was George, “Are you playing football tomorrow, Pops?”
Prince William also revealed in 2007 that his mother had a nickname for him.
William revealed Diana referred to the Prince as ‘wombat.’
He said: “I can’t get rid of it now.
“It began when I was two,” he said.