The white gown was covered in pink and green flowers.
Queen Elizabeth II also wore a pair of white gloves.
She carried her small black Launer handbag which was perched on her left arm.
The royal will often complete her looks with a brooch and wore a gold and diamond piece for the event.
She also wore her signature pearl necklace.
The piece, which Queen Elizabeth II often wears, consists of three rows of pearls.
The monarch was seen arriving with other members of the Royal Family.
She walked by her son and the future King, Prince Charles.
Kate’s dress had a fitted bodice which pulled in at the waist before flaring into a pleated skirt.
The skirt cut off at the knee and she chose to leave her legs bare.
The Duchess of Cambridge finished the look by wearing a pair of nude closed toe heels.
She was seen carrying a small envelope clutch bag.
The royal line of succession – who outranks who?
The line of succession to the British throne dictates the order in which each member of the Royal Family would ascend to the throne.
It is also seen as a ranking of importance with the head of the line, the Queen, taking the place of ruler.
Older children come before younger children. Traditionally boys came before girls, but this law was changed on 26 March 2015 before the birth of Prince William’s first child.
Incredibly, Catholics are still excluded from the line of succession, as are children born outside of wedlock.
The royals, who usually stick to a strict protocol when appearing in public, often arrive at events in ascending order of importance, with the most important royal arriving last.
Prince Charles, 72, is currently first-in-line to the British throne, followed by Prince William, 38, his oldest son.
Then comes Prince William’s children, George, seven, Charlotte, five, and Louis, two, and they are followed by Prince Harry, 36. Prince Harry is succeeded by his son Archie Harrison, born in May 2019.