Prince William, 42, and Kate, 43, were among the senior royals at the thanksgiving service to mark the 80th anniversary at Westminster Abbey in central London.
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Also in attendance were the Duke and Duchess of Edinburgh, the Princess Royal and Sir Tim Laurence, the Duke and Duchess of Gloucester and the Duke of Kent.
The royal family led the congregation in a national two-minute silence of reflection and remembrance. The King then laid a wreath at the Grave of the Unknown Warrior, followed by the Prince of Wales.
WATCH: The royals depart after VE Day service
After the service, the King and Queen, and senior royals met veterans in the congregation, with the Princess smiling as she crouched down to speak to one lady.
Camilla also led the royals in laying flowers at the Innocent Victims' Memorial, outside the Abbey's West Door.
The royals arrived in reverse precedence at the service. The Princess Royal, who was accompanied by her husband, Vice Admiral Sir Tim Laurence, donned a blue embroidered coat and matching hat.
The Duke and Duchess of Edinburgh arrived alongside the Princess Royal. Sophie matched her sister-in-law in blue, wearing a long-sleeved dress by Beulah London.
Prince William looked smart in a blue lounge suit with a Household Division tie. He wore his Great Master of the Most Honourable Order of the Bath Neck Order and also sported his Jubilee and Coronation medals.
Kate opted for a white polka dot midi dress by Alessandra Rich, previously worn for the Garter Day service in 2023.
The Princess accessorised with a black veiled hat by Juliette Botterill and pearl earrings, which once belonged to William's late mother, Princess Diana.
Her Majesty was elegant in a white crepe silk dress and white coat with black stitching by Anna Valentine, with a black and white hat by Philip Treacy.
She sported the brooch of the 12th Lancers - a nod to her late father's regiment.
The Queen and the Princess of Wales, who coordinated in white outfits, stood for the two-minute silence around the Grave of the Unknown Warrior near the West Door in solemn tribute to those who fought for freedom during the Second World War.
The King moved forward to lay a wreath at the black marble Grave of the Unknown Warrior, followed by the Prince of Wales.
Their floral tributes were made of seasonal flowers including pink, white and peach roses, which would have been found in bloom 80 years ago on 8 May 1945.
The prince stepped back and bowed his head in tribute after leaving his wreath.
Charles placed his wreath on behalf of the nation and the Commonwealth while William did so for the veterans and the Second World War generation.
At their side, watching from his wheelchair, was veteran Ken Hay, 99, who served in the infantry regiment.
The Prince and Princess of Wales's message on their wreath read: "For those who made the ultimate sacrifice during the Second World War. We will remember them. William and Catherine."
The Princess of Wales crouched down to meet one woman, holding her hand as she chatted to the veteran, who was wearing medals and sat in her wheelchair.
The Princess of Wales left a posy of colourful flowers at the large circular slate Innocent Victims' Memorial outside the Abbey on departure, as did the Queen.
The blooms were picked on Wednesday within the walls of Windsor Castle and the surrounding estate.
They included rosemary for remembrance, oak for endurance and bluebells which traditionally represent gratitude.
Former prime minister Rishi Sunak was in attendance, along with his wife, Akshata Murty, who sported a collared red shift dress.
Later on Thursday, the King and Queen will be at Horse Guards Parade for a celebratory concert where Second World War veterans are expected to be among more than 12,500 guests.
A Buckingham Palace aide said ahead of commemorations: "The King, Queen and other members of the royal family are much looking forward to all the week's VE Day events, when they will unite with the rest of the nation and those across the Commonwealth and wider world in celebrating, commemorating and giving thanks to the wartime generation whose selfless devotion duty and service should stand as an enduring example to us all – and must never be forgotten."
5 royals in dotty dresses
Did you love Princess Kate's Alessandra Rich polka dot gown? She is by no means the first royal to rock the dots, and over on The HELLO! Royal Club Danielle has selected five of her favourite dotty royal dresses for club members to vote on. You can join them now and have your say simply by clicking on the button below.
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