Prince George's adorable nickname for Queen Elizabeth disclosed

On Queen Elizabeth's 90th birthday two years ago, a documentary was put together to review the main milestones in her life.

Ahead of the release of the piece, called "Our Queen At Ninety," Kensington Palace shared a segment from the interview that the Duchess of Cambridge, Kate Middleton, gave for the documentary.

One of the most remarkable personal details that surfaced from Middleton’s talk with the producers was the special nickname that Prince George invented for his great-grandmother.

"George [was] only two-and-a-half and he calls her “Gan-Gan." She always leaves a little gift or something in their room when we go and stay and that just shows her love for her family," said the Duchess.

Read more on our Twitter account @amomama_usa. Middleton maintained that the Queen cultivates a close relationship with her great-grandchildren.

"The Queen was really thrilled that it was a little girl, and I think as soon as we came back here to Kensington she was one of our first visitors here," added Prince William's wife.

The interview was the first Middleton gave unaccompanied since the announcement of her engagement to Prince William in 2010.

The historic ITV documentary includes more contributions from members of the royal family than any other film about the British royals.

"Our Queen At Ninety" was first broadcasted on Easter Sunday in 2016 and showcased the royal family's light-hearted side.

PRINCE PHILIP'S NICKNAMES FOR THE QUEEN

The affectionate names within the family aren’t only used by the little ones, and several of the private ways that England’s royals use to address one another have surfaced over the years.

The royal family uses many nicknames in their private lives. The Queen’s husband, 97-year-old Prince Philip has been known to have the most peculiar names for his wife, including "Sausage."

After seventy years of marriage, it is only normal that the couple has found intimate ways to refer to each other. The Queen, in turn, reportedly calls him "The Hun."

THE DUCHESS OF SUSSEX HAS A NICKNAME TOO

When Meghan Markle joined the royal family in May, she received her own nickname, even if it is not the most glamorous one, by her father-in-law, Prince Charles.

Charles has a rather unusual but touching nickname for Markle. According to a royal insider, Prince Charles calls the Duchess of Sussex "Tungsten" because she is as strong as the metal.

Charles and Markle share a close loving bond, as was evident when she asked the 69-year-old to accompany her down the aisle when she tied the knot with Prince Harry.

"GARY"

Before little George started to call Queen Elizabeth "Gan-Gan", his own father William came up with "Gary" as his way to call his grandmother.

A guest at the royal household heard him call her that when he was a toddler. As the source said, this person saw little William fall down at the Buckingham Palace.

As he got up crying, the little boy started to call for "Gary." When the person asked who was this "Gary," the Queen allegedly said it was she.

"He hasn’t learned to say Granny yet," the monarch was quoted with saying.

Many years later, however, William and Harry could be heard screaming "Go, Granny!" in unison during the Queen’s hilarious appearance at the 2012 Olympic Games.