The Queen, 92, wore blue for her official birthday celebrations today outside Buckingham Palace.
Kate, the Queen’s granddaughter-in-law, and Camilla, her daughter in law, matched Her Majesty in blue outfits.
The three women also all chose to wear outfits that were created by British fashion designers.
However, Meghan turned up in a different hue, opting to wear a pale pink colour while riding in a carriage at the parade alongside Prince Harry.
Her dress is a bespoke design by Venezualen designer Carolina Herrera, who was a favourite of American First Ladies.
Meghan is the newest member of the royals and the Queen’s granddaughter-in-law after her marriage to Prince Harry.
While there is no official rule governing what colours royals must wear at the Trooping the Colour parade, Meghan certainly stands out from the other royals.
The Duchess of Sussex’s dress is a similar pale colour to the nude dress Meghan wore to Prince Charles’ birthday garden party.
While Meghan’s nude dress bared her shoulders, Camilla and Kate chose much more conservative looks.
Meanwhile, the Queen wears her trademark brightly coloured skirt suit and matching hat.
The suit is a design by Stewart Parvin, the Queen’s dressmaker for nine years.
Kate Middleton opted for a blue dress by late British designer Alexander McQueen.
Today’s marks Meghan’s first Buckingham Palace balcony appearance, a milestone of her new role as a royal.
Why does the Queen’s birthday change every year? Royal fans may observe the Queen’s official birthday date for 2018 is different compared to last year.
Her birthday was celebrated on Saturday 17 June in 2017, as opposed to June 9 this year.
It is usually celebrated on the second Saturday in June each year, according to the Royal.uk website.
The choice of a weekend day means the public are more likely to be able to celebrate it.
The Queen’s official birthday was originally celebrated on the second Thursday of June, the same day her father, King George VI, chose to celebrate his.
However, in 1959 she made a decision to change her official birthday to two days later on the second Saturday of June instead.