In their first joint appearnece since returning from their honeymoon two days ago, new bride Meghan, 36, stood next to her uniform-clad husband Harry on the famed balcony as she watched the patriotic march to celebrate the Queen's official birthday.
Meghan dazzled in her pastel pink off-the-shoulder dress and fashionable hat as she waved to the thousands of fans below while standing with Prince William and Kate, Princess Beatrice, bride-to-be Eugenie and Sarah Ferguson and Zara Tindall.
The Duchess of Sussex's dress was by Carolina Herrera and her hat by Philip Treacy.
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The new Duchess of Cambrige, a former actress from hit US TV show Suits, showed off her stunning wedding ring with a flick of her long, dark hair as she passed cheering crowds in their thousands who flocked to the Capital for the bash in honour of the Queen.
Glamorous Meghan, 36, appeared to be listening intently to her uniform-clad husband, before bursting into giggles as the horse-drawn carriage passed scours of fans.
Husband-and-wife were greeted by the sight of hundreds of Guardsmen in their scarlet tunics and bearskins lined up on the parade ground - Henry VIII's former jousting yard - as the event began.
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The Duke and Duchess, who married exactly three weeks today in a lavish Windsor ceremony, travelled from Buckingham Palace along the Mall to cheers from crowds gathered in the famous London thoroughfare.
Harry and Meghan looked smitten together for the event which is staged on Whitehall's Horse Guards Parade.
It will be a first for Meghan, who will join the rest off the royal family on the famed Buckingham Palace balcony after the parade.
The couple, who returned from their honeymoon to the UK two days ago, were one of the first to rock up to the parade.
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The Queen, 92, wore blue with a floral hat of the same colour as she rode to the march without her husband, the Duke of Edinburgh who did not attend after returning from public duties.
Though the Queen was accompanied by the royal colonels, all on horseback: Prince of Wales, Colonel of the Welsh Guards, the Princess Royal, Colonel of the Blues and Royals, and the Duke of Cambridge, Colonel of the Irish Guards.
She recently had an eye operation to remove a cataract meaning she will be able to watch the magnificent parade uninterrupted and in full health.
Also in attendance today is Prince William, who attended moments after the Duke and Duchess of Sussex, with wife Kate.
Kate is in a powder blue Alexander McQueen dress while William, like his younger brother, is also in uniform.
Their children George, Charlotte and Louis are yet to be seen but are likely to join them on the royal balcony later on.
Mother-of-three Kate and Prince William travelled with Camilla in a carriage to the celebration.
The Duchess of Cornwall, in blue silk, and Duchess of Cambridge were in another carriage while a third carried Princesses Beatrice and Eugenie, the Countess of Wessex and her daughter Lady Louise.
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More than 1,000 soldiers take part in the traditional display of pomp and pageantry with members of the royal family gathering on the balcony of Buckingham Palace to watch the RAF flypast, which is set to take place at 1pm.
The 7,500 guests seated in stands lining the parade ground stood as a mark of respect as the monarch arrived and began inspecting the massed ranks of the troops.
Also riding in the ceremony for the first time was the Duke of York in his new role as Colonel of the Grenadier Guards.
Among the guests was Defence Secretary Gavin Williamson, the Prime Minister Theresa May normally attends but is at a G7 meeting of world leaders in Canada.
The parade is now taking place with the royals in attendance all having gathered to watch.