Pippa Middleton opts for chic £450 tweed suit from Salvoni as she turns out to support her sister Kate at Westminster Abbey carol concert

Pippa Middleton looked chic next to her husband James as they arrived at Kate's Christmas carol concert at Westminster Abbey this evening.

The Princess of Wales' younger sister looked festive in a colorful £450 Saloni tweed suit, which was trimmed and fitted with a luxurious velvet belt, as she stepped out to attend the Together At Christmas service on Friday evening.

The mother of two, 40, dressed warmly in a black turtleneck under her blazer.

She completed her ensemble with suede heels and a matching designer clutch.

The beauty opted for a sleek, straight hairstyle and added even more glamor with diamond earrings.

James Matthews looked sharp in a navy suit which he teamed with a white shirt and pink tie.

The service will recognize the selfless efforts of communities across the UK and highlight the importance of coming together to support each other.

Under Kate's leadership, it will combine both traditional and modern elements, reaching people of all faiths.

The service, Royal Carols: Together at Christmas, will then be shown on ITV on Christmas Eve.

The service will see the world-famous Westminster Abbey choir perform some of the country's best-loved Christmas carols, alongside musical performances from guests including Jacob Collier, Freya Ridings and James Bay, and a special duet from Beverley Knight and Adam Lambert.

There will be moving talks from speakers including Prince William, Michael Ward, Emma Willis, Roman Kemp and Jim Broadbent.

This year's theme is Kate's 'Early Years' campaign, designed to highlight how important what happens to children between birth and five years is in shaping their development as adults.

Among the 1,500 invited guests tonight are parents, carers, teachers, midwives, health visitors and community volunteers.

They have all been nominated by Lord-Lieutenants from across the country or by charities linked to the Royal Family, as well as by people the Princess knows personally through her work in the field at her Royal Foundation for Early Childhood Centre.

Some families with young children who have had a particularly challenging year have also been invited after being nominated by charities with which the Princess has links.

The service, which combines traditional and modern elements, will see the Westminster Abbey choir perform alongside musicians including singers Freya Ridings and James Bey, with a special duet by Beverley Knight and Adam Lambert from The Christmas Song, made famous by Nat King Cole.

Lectures will be given by Prince William, actor Jim Broadbent, presenter Emma Willis and actor Michael Ward.

Host Roman Kemp introduces the special rendition of Last Christmas on Lennon's piano, discussing the role George Michael played in his own life (his mother, Shirlie Kemp, was one of his backup singers) and the story of the piano itself .

A source told the Mail that the instrument had been loaned by his estate, who were keen to support this year's service.

Tonight's service will be attended by the princess's family, friends and other members of the royal family.

Although he will not attend due to a diary conflict, the King has donated Christmas trees from Windsor Great Park to decorate Westminster Abbey, which will be donated to the local community after the service.

The abbey will also be filled with sustainable, eco-friendly party decorations.

Outside, the Princess has had a special letterbox installed, with guests encouraged to take a card with them that will be distributed to children who may be struggling this year through charities such as Child Bereavement UK, East Anglia Children's Hospice, Evelina London and the British Red Crotch.

They will also be greeted with carols and carols by the Action for Children Young Carers Aloud Choir, made up of twelve young carers aged six and up.

A royal aide said the princess – who will not speak that evening but will feature in a pre-filmed introduction to be broadcast on Christmas Eve – hoped the service would remind people of “how precious” the early years of a woman's life child at a time when the world is celebrating the birth of a newborn baby.

“It reminds us how unique this time is and how precious those early years are, as we begin to form our very first relationships, bond with those closest to us and explore the world we live in” , they said.

'It also means hope. As we look to the future, we hope that our children will grow up in a happier, healthier, fairer, kinder and more tolerant world. A world based on love and compassion.

“This evening, Westminster Abbey will be filled with more than 1,500 inspiring people in appreciation of their selfless support as they work tirelessly to help the youngest members of our society thrive.”

Royal Carols: Together at Christmas airs on December 24 at 7.45pm on ITV1 and ITVX