KATE Middleton stunned onlookers in all of her finery at the coronation of King Charles yesterday.
But the royal mum-of-three cut a more casual figure in trainers and a blazer as she greeted crowds in Windsor today.
The Princess of Wales was elegant in a £298 cornflower blue blazer from Reiss which she paired with a fitted trouser as she and Prince William surprised crowds gathering for the Big Lunch in the city this afternoon.
The Reiss 'Hollie' blazer is a known favourite of Kate's, who has worn the camel version on several occasion, last seen in it during her visit to Windsor's Baby Bank last month.
Kate opted for a pair of trainers from Veja, a favourite of the princess, to make her way around the park in the form of a simple white sneaker.
Opting for light layers in the unpredictable weather, Kate wore a simple white t-shirt under her jacket.
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After yesterday's ornate up-do Kate was keen to let her hair down, quite literally, wearing her brunette tresses loose in a soft wave.
In terms of accessories, the royal style icon opted for a simple pearl drop earring for a classy finish.
The couple chatted to crowds who had gathered for the celebrations, with one pair offering the pair a can of their King Charles beer which featured the monarch on the label.
The Prince and Princess even enjoyed a tipple of Purple Reign gin made by royal fan Dion English in a Union Jack paper cup as they chatted.
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Dion said: “I feel amazing that he (William) tried my gin. He said it was very nice and he said ‘Kate, try this’.
“He took the Return of the King beer and said he’s going to ask his dad if he’s tried it.”
Thousands are taking part in the event today to mark the beginning of King Charles’ reign.
More than 3,700 lunch parties to mark King Charles III's coronation are happening across Britain.
The royal couple were all smiles as they greeted well-wishers who offered the prince and princess a warm welcome following the coronation yesterday.
Kate, 41, and daughter Princess Charlotte, 8, were the perfect pairing yesterday as they arrived at Westminster Abbey for the historical event.
Both Charlotte and the Princess of Wales opted for ivory silk crepe Alexander McQueen dresses for the celebration.
The mum and daughter duo arrived at Westminster Abbey along with dad Prince William, 41, and Charlotte’s brother, Prince Louis, five.
Prince George, nine, travelled separately from his family to the Abbey, with other Pages of Honour from Buckingham Palace.
Both Kate and Charlotte’s outfits also feature a subtle nod to the United Kingdom in the embroidery.
Their stylish dresses include rose, thistle, daffodil and shamrock motifs to symbolise the four nations; England, Scotland, Wales and Northern Ireland.
Kate also wore a Jess Collett x Alexander McQueen Headpiece with silver bullion, crystal and silver thread work three-dimensional leaf embroidery.
While Princess Charlotte wore a matching headpiece by the same designer.
Kate also paid tribute to Princess Diana, wearing pearl and diamond earrings that belonged to the late royal.
She paired the beautiful earrings with the George VI Festoon Necklace.
The necklace was made in 1950 at the request of King George VI for his daughter, Princess Elizabeth, who was crowned Queen in 1953.
King Charles was joined by his family and world leaders at Westminster Abbey as he pledges his life to the country.
The family later travelled from the abbey back to Buckingham Palace where the newly crowned King and Queen were joined by their families to wave to crowds assembling on the Mall.
Later today the King and Queen will join around 20,000 members of the public at the coronation concert where, along with other family members, they will see performances by Take That, Katy Perry and Lionel Richie.
Singers Perry and Richie were among the stars at Saturday's coronation ceremony in Westminster Abbey.
The show in Windsor, hosted by Paddington and Downton Abbey actor Hugh Bonneville, will see Hollywood star Tom Cruise, Dynasty actress Dame Joan Collins, adventurer Bear Grylls and singer Sir Tom Jones appear via video message.
The series of pre-recorded sketches will reveal little-known facts about the monarch and will also include moments from beloved literary figure Winnie the Pooh - seemingly echoing the famous moment Paddington Bear drank tea with the Queen during her Platinum Jubilee celebrations.
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There will also be performances by Paloma Faith, Olly Murs, veteran rock guitarist Steve Winwood, and Nicole Scherzinger of The Pussycat Dolls.
Classical acts including Andrea Bocelli, Welsh bass-baritone Sir Bryn Terfel and Chinese pianist Lang Lang will perform too.