Princess Kate is beautiful in fitted suit as she parties at Windsor Castle

The Princess of Wales has arrived at King Charles' coronation concert at Windsor Palace, looking beautiful in a red fitted suit as she smiled at the crowds.

The royal defied expectations in a double-breasted two-piece in the most eye-catching Alexander McQueen two-piece, opting for a modern look for the fun-filled evening of celebrations. Princess Kate teamed her eye-catching two-piece with a glittering  Van Cleef & Arpels necklaceas she partied alongside her husband Prince William.

Kate wore her brunette locks down loose in tumbling curls cascading down her shoulders. She kept her makeup fresh and natural, sporting a soft, smoky eye and a nude lip.

The doting mother was seen fussing over children Princess Charlotte and Prince George while little Louis gave the evening a miss following his high profile public appearance at the coronation the previous day.

The big party is being held at Windsor Castle to celebrate King Charles and Queen Consort Camilla's coronation on Saturday – and the royals were out in force to enjoy the music and various performances.

WATCH: Princess Kate's first curtsey to King Charles captured in moving clip

Princess Kate, Princess Charlotte and Prince George were seated in the royal box
Princess Kate, Princess Charlotte and Prince George were seated in the royal box

The show's starry lineup includes Lionel Richie, Katy Perry, Andrea Bocelli, Take That and Freya Ridings – as well as performances from the royal ballet and Doctor Who and Sex Education star Ncuti Gatwa.

karen millen red blazer like princess kate
karen millen red blazer like princess kate

GET THE LOOK: £139.30 (WAS £199) AT KAREN MILLEN

BBC Radio 2 presenter Zoe Ball was forced topull out of covering the coronation concertat the last minute after falling ill. Scott Mills will take over from Ball to chat to the crowd ahead of the concert, while Dermot O’Leary will be backstage speaking to the stars before they perform.

prince william and Kate Middleton take their seats at king charles coronation concert windsor castle
prince william and Kate Middleton take their seats at king charles coronation concert windsor castle

On Friday, it was confirmed that singer-songwriter Freya Ridings had also pulled out of the concert due to a mystery illness. She will be replaced by Be Kind hitmaker, Zak Abel.

van cleef and arpels lookalike necklace dupe
van cleef and arpels lookalike necklace dupe

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Kate's glowing look comes just hours after the royal and Prince William made an unexpected appearance in Windsor on Sunday, greeting coronation concert-goers on The Long Walk.

Princess Kate looked beautiful in a red suit
Princess Kate looked beautiful in a red suit

Keeping it casual after her spellbinding appearance in a custom Alexander McQueen gown and Aquazzura heels yesterday, the royal opted for her trusty VEJA 'Esplar' metallic trainers with her springlike ensemble.

Princess Kate carved an exquisite silhouette in a powder blue blazer from Reiss, teamed with a relaxed white T-shirt and fitted black trousers to surprise royal fans ahead of the Coronation Big Lunch event.

Princess Kate looked gorgeous in her scarlet suit
Princess Kate looked gorgeous in her scarlet suit

It has been a busy few days of celebrations for the royal family, with the traditional coronation ceremony taking place at Westminster Abbey on Saturday, and a formal royal reception at Buckingham Palace on Friday evening.

On bank holiday Monday, King Charles' coronation events will round out with a community effort called the 'Big Lunch', for which neighbours and communities are invited to share food and fun together.

The King is also encouraging the country to get involved in the 'Big Help Out' on Monday, which involves taking part in local volunteering work being undertaken to support their local areas.

Take a look at our favourite photos of Princess Kate from King Charles' coronation weekend

Kate middleton and Prince William look at each other
Kate middleton and Prince William look at each other
Princess Charlotte and the Catherine, Princess of Wales during the Coronation of King Charles III and Queen Camilla on May 6, 2023 in London, England.
Princess Charlotte and the Catherine, Princess of Wales during the Coronation of King Charles III and Queen Camilla on May 6, 2023 in London, England.

DON'T MISS: 10 times Princess Kate dazzled in show-stopping tiaras

Princess of Wales wears headpiece at the coronation of King Charles
Princess of Wales wears headpiece at the coronation of King Charles
The Princess of Wales wore a bespoke Alexander McQueen gown beneath her coronation robes
The Princess of Wales wore a bespoke Alexander McQueen gown beneath her coronation robes
The royal appeared in high spirits
The royal appeared in high spirits

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