The Princess of Wales wowed in a sleek ensemble as she headed to the Together at Christmas carol concert at Westminister Abbey on Friday.
Kate, 41, opted for an all white ensemble continuing her recent penchant for suited looks.
Proving she's the queen of casual luxury, Kate Middleton mixed high street and high end, adding £5,400 'Van Cleef Arpels Magic Alhambra Earrings with 2 Motifs' to the look.
As she headed into the Abbey alongside children George, Louis and Charlotte and husband William, Kate looked sleek in a bespoke coat by Saville Rowe tailor Chris Kerr, which is estimated to cost up to £10,000.
She paired the look with a £99 kiltane cashmere crew neck jumper in off white, which she has worn before and £299 Holland Cooper high waisted trousers.
The Princess of Wales wowed in a sleek ensemble as she headed to the Together at Christmas carol concert at Westminister Abbey on Friday
Kate, 41, opted for an all white ensemble continuing her recent penchant for suited looks
Accessorising like a pro, the royal added a £395 Strathberry Mosaic Nano Bag in Vanilla, Kate boosted her height with her favourite Gianvito Rossi ‘Gianvito 105’ Bisque Suede Pumps which she owns in several colours.
The mother-of-three's make-up complemented the glamour look.
Opting for red carpet style glitz, Kate wore her hair in a bouncy blow-dry while wowing with a pink lip and smoky eye shadow.
Kate hosted her Together At Christmas event at Westminster Abbey and welcomed her family, members of the monarchy and inspiring individuals in celebration of those supporting children and families.
The Prince of Wales arrived with Prince George, Princess Charlotte and Prince Louis, after Kate travelled ahead to thank celebrities for agreeing to perform, including Oscar winner Jim Broadbent and singers Beverley Knight and Adam Lambert.
As they walked into the Abbey's forecourt the royal children paused for a moment to post Christmas cards, in a special postbox, containing messages for children who might be struggling this Christmas, something open to all youngsters attending.
The young royals - George, 10, Charlotte, eight, and five-year-old Louis - were all smartly dressed while their mother wore a Chris Kerr coat.
Before the concert started Kate met celebrities in the Abbey's stunning 16th century Lady Chapel, and chatting to Broadbent expressed her appreciation at him agreeing to read an extract from Letters From Father Christmas by Lord Of The Rings author JRR Tolkien.
Kate arrives for the 'Together At Christmas' Carol Service at Westminster Abbey
The Princess of Wales waves as she arrives for the service at Westminster Abbey
The Princes of Wales leads her two elder children Princess Charlotte and Prince George into Westminster Abbey
The Princess of Wales' Together at Christmas service will be broadcast on ITV1 on Christmas Eve
Prince Louis helps blow out his sister's candle at the end of the service
She said: 'Thank you for your time because I know the lead up to Christmas can be busy for people.'
Kate appeared to joke with multi-instrumentalist Collier, who has posted music tutorial videos on YouTube, about her daughter learning the piano and he quipped 'many a plink and a plonk'.
She also walked around the Abbey before the event began, speaking to young people who have done inspiring activities.
Once inside, Kate stole the show as she led the royal family and high-fived and spoke with children who have gone 'above and beyond' for charity.
Kate crouched down to chat to seven-year-old Oscar Burrow, from Lancaster, who raised more than £40,000 for Derian House Children's Hospice in Chorley, Lancashire, by climbing 12 mountains at the age of six.
His mother Kimberley Burrow said afterwards: 'She said she'd heard about what he's done and he's doing a fantastic job, and hopes what he's doing will inspire other children to do amazing things.'
The princess was joined at her annual Christmas carol service by Prince William and children Prince George, Princess Charlotte and Prince Louis.
The Royal children were seen stepping in to the event at Westminster Abbey - while five-year-old Prince Louis once again drew attention by blowing out his sister's candle and chatting to a statue outside.
Princess Kate was seen high-fiving scouts from the 3rd Upton Scout Group in Slough
Kate crouched down to chat to seven-year-old Oscar Burrow, from Lancaster, who raised more than £40,000 for Derian House Children's Hospice
The Princess of Wales knelt down to light Prince Louis' candle for the concert
The princess met with children who have gone 'above and beyond' for charity
Kate stunned in all white as she arrived for the annual Christmas concert
Kate walked around the Abbey before the concert started speaking to young people who have done inspiring activities.
She knelt down and spent time speaking with seven-year-old Oscar.
The princess placed her hand on a chair and the other in her lap as she discussed his impressive fundraising efforts, watched on by his smiling mother.
She chatted to four scouts from the 3rd Upton Scout Group in Slough her family visited during the coronation celebration weekend, part of The Big Help Out event, helping to renovate their hut.
The princess told them: 'It was really inspiring. Seriously, good job'. She then high-fived each scout in turn.
Kate, who was dressed all in white for the occasion, was pictured bending down to light Prince Louis' candle with her own.
At one point she was seen placing a reassuring hand on his back as he appeared to clutch at her coat amidst the gravity of the evening.
As she arrived at the concert, she was seen holding Princess Charlotte's hand.
Among the group of celebrities waiting to greet the family in the Abbey's Lady Chapel were singers Beverley Knight and Adam Lambert, musician Jacob Collier and actor Jim Broadbent.
Catherine's sister Pippa and husband James Matthews were also photographed arriving this afternoon, as were Lady Sarah Chatto and her husband Daniel Chatto.
The Princess herself unveiled a very special festive gift to guests at the concert - a rendition of Last Christmas played on John Lennon's piano.
The Princess of Wales places a reassuring hand on Prince Louis' back as he appears to clutch at her coat
The Princess of Wales was seen sharing a smile with little Oscar as she took time out of her schedule to speak with him
Kate knelt down to speak to children who have achieved inspirational fundraising milestones
Prince George, Princess Charlotte, the Princess of Wales and the Prince of Wales arriving for the Royal Carols - Together At Christmas service
Prince George, Princess Charlotte and Prince Louis hold candles during the Royal Carols - Together At Christmas service
Kate arrives for the 'Together At Christmas' Carol Service at Westminster Abbey today
The Princess herself unveiled a very special festive gift to guests at the concert - a rendition of Last Christmas played on John Lennon 's piano
The Princess of Wales was joined by her three children at Westminster Abbey, each holding candles ahead of her Together at Christmas carol service
The Princess of Wales and Princess Charlotte (left) smile as Prince Louis (centre) looks on at the carol service
The Princess of Wales meets with celebrities including Adam Lambert ahead of the Christmas concert
Prince George of Wales and Princess Charlotte lead the way into Westminster Abbey, accompanied by their parents
The Princess of Wales' sister Pippa Matthews (left) and her husband James attend the service
Pippa Matthews wore a sequined trouser suit as she arrived at Westminster Abbey
The Princess of Wales waves as she arrives for the service at Westminster Abbey today
The Princes of Wales leads her two elder children Princess Charlotte and Prince George into Westminster Abbey
The Princess of Wales' Together at Christmas service will be broadcast on ITV1 on Christmas Eve
Prince Louis helps blow out his sister's candle at the end of the service
The Princess of Wales (right) appears to have a word with Prince Louis (left) after the service
Prince Michael of Kent and his daughter Lady Gabriella Kingston were among the guests
The Prince and Princess of Wales and their children arrive for the carols
Lord Frederick Windsor, Sophie Winkleman and their children attend the 'Together At Christmas' Carol Service
Prince Richard and his wife Birgit, Duke and Duchess of Gloucester, arrive at Westminster for the carols service
Princess Charlotte held her mother's hand as she walked into the service
Princess Charlotte of Wales, Prince Louis of Wales and Prince George of Wales post letters to Santa before The 'Together At Christmas' Carol Service
Prince Louis looks over a statue of a royal guard as he and his family depart the abbey
The Princess of Wales' 'Together At Christmas' Carol Service at Westminster Abbey is one of her key events of the year
Christopher Woolf also posted a letter to Santa while step-mother Princess Beatrice and Edoardo Mapelli Mozzi looked on
The Princess will tonight unveil a very special festive gift to guests at the concert - a rendition of Last Christmas played on John Lennon 's piano.
Kate arrives for the 'Together At Christmas' Carol Service at Westminster Abbey today
Princess Eugenie looked smiley as she was photographed arriving for the Royal Carols
Princess Eugenie, who recently welcomed her second son named Ernest with husband Jack Brooksbank, was among the guests
The Prince of Wales, Prince Louis, Princess Charlotte, Prince George and the Princess of Wales are greeted by The Dean of Westminster ahead of the carol service
Dean of Westminster, David Hoyle greets the royal children ahead of the service
Before the concert started, Kate met celebrities in the Abbey's stunning 16th century Lady Chapel, and chatting to Broadbent expressed her appreciation at him agreeing to read an extract from Letters From Father Christmas by Lord Of The Rings author JRR Tolkien.
She said: 'Thank you for your time because I know the lead up to Christmas can be busy for people.'
Kate appeared to joke with multi-instrumentalist Collier, who has posted music tutorial videos on YouTube, about her daughter learning the piano and he quipped 'many a plink and a plonk'.
The service began with the popular carol, Once In Royal David's City, and the congregation also heard a duet by Beverley Knight and Adam Lambert who performed The Christmas Song, made famous by Nat King Cole.
William read the passage from the Gospel according to Luke that describes how Joseph and Mary travelled to Bethlehem to be registered and the birth of Jesus.
The Abbey echoed with the voices of its choir and the congregation singing a selection of carols including Silent Night, Holy Night and Joy To The World, as well as Hark! The Herald Angels Sing.
The historic building featured Christmas trees from Windsor Great Park donated by the King, which will be given to local communities after the service.
The event will be broadcast as part of Royal Carols: Together At Christmas, a special programme airing at 7.45pm on ITV1 and ITV X on Christmas Eve, featuring additional material including an introduction by Kate and films emphasising the importance of early childhood.
The broadcast will include contributions from Rio and Kate Ferdinand, Ugo Monye, Andrea and Virginia Bocelli and Dame Sheila Hancock.