Night out with her nieces! Zara Tindall joins her brother Peter Phillips and his children Savannah and Isla to attend Kate's carol concert

Zara put on a festive display as she stepped out tonight to attend Kate Middleton's Christmas carol service at Westminster Abbey in London. 

The niece of King Charles, 41, was accompanied by her brother Peter Phillips, 46, with both putting on a cheerful display as they entered the Christmas service.

Zara looked radiant in deep purple winter coat. She accessorised the outfit with an matching pair of statement earrings shoes and a crocodile leather bag. 

The mother-of-three opted for a simple yet elegant makeup look for the occasion, complete with a nude lip and a touch of eyeliner. 

Zara, who recently announced she's gone part-time in her equestrian career so that she can be around more for her three children, styled her blonde tresses in a slicked back bun for the occasion. 

Zara appeared to attend the event without her husband Mike Tindall, 45. 

Instead, her brother, Peter Phillips, the eldest grandchild of Queen Elizabeth II, accompanied her this evening, alongside his daughters ) Savanah, 12,  and Isla, 11.

The purpose of the concert, which will also be attended by King Charles and Queen Camilla, is to 'recognise the selfless efforts of communities throughout the UK, highlighting the importance of coming together to support one another'.

Spearheaded by the Princess, it has been designed to bring together people of all faiths - and of none - by combining both traditional and modern elements.

The service, Royal Carols: Together at Christmas, will is being filmed tonight, but will be broadcast shown on ITV on Christmas Eve.

The service will see the world-renowned Westminster Abbey choir perform some of the nation’s most beloved carols, alongside musical performances by guests including Jacob Collier, Freya Ridings and James Bay, and a special duet from Beverley Knight and Adam Lambert. 

Poignant readings will be delivered by speakers including Prince William, Micheal Ward, Emma Willis, Roman Kemp, and Jim Broadbent. 

A specially commissioned poem written by Joseph Coelho, the Children’s Laureate, will also be read by Leonie Elliott. 

The broadcast will also feature an introduction from Kate and films which bring to life the importance of early childhood and celebrate the remarkable contribution people in our communities are making to support the very youngest members of our society during those crucial early years.

 These will include contributions from Rio and Kate Ferdinand, Ugo Monye, Andrea & Virginia Bocelli and Dame Sheila Hancock. 

The service will see Westminster Abbey filled with sustainable, eco-friendly festive decorations, providing a beautiful Christmas backdrop, nodding to the theme of children and families. 

New features this year include a Christmas Post Box located outside the Abbey for children to send handmade Christmas cards and best wishes to other children who might be struggling this year. 

In addition, guests will be treated to carols and Christmas songs upon arrival from the Action for Children Young Carers Aloud choir, made up of 12 young carers, the youngest of which is just six years old.   

It comes after a beaming Kate posed in front of a Christmas tree for the carol service promotional clip on Thursday.

Guests attending the service have been nominated by Lord-Lieutenants across the nation, in addition to charities associated with Members of the Royal Family. 

They will be joined by those working in the early years space which is a key focus area of The Princess of Wales’s work through The Royal Foundation Centre for Early Childhood. 

It will also consist of those who may have had a challenging year, including children and families, or those who might find the winter period difficult. 

Kate's appearance in the teaser clip comes comes after a week of drama for the Royal Family following the explosive accusations by author Omid Scobie.

In a Dutch translation of his new book Endgame, the Princess of Wales and King Charles were named as the alleged 'royal racists' who questioned what skin colour Prince Harry and Meghan Markle's son, Archie, would have before he was born.

Neither Buckingham Palace or the Duke and Duchess of Sussex have commented on any of the allegations by Mr Scobie - revealed in the Dutch version of his 400-page tome, with the Firm instead appearing to stick by the age-old royal dictate of 'never complain, never explain'.

Royal Carols: Together at Christmas will be broadcast on Christmas Eve at 7.45pm on ITV1 and ITVX.