Princess Beatrice's stepson Wolfie joins George, Charlotte and Louis with Isla and Savannah Phillips at Kate Middleton's carol concert

Young royals joined together on Friday to attend The Princess of Wales' carol concert at Westminster Abbey.

Cheeky Prince Louis, five, his sister Princess Charlotte, eight,  and brother Prince George, 10, were joined by their second cousins Savannah Phillips, 12,  and Isla Phillips, 11.

Also joining them was Princess Beatrice's step-son Christopher Woolf Mapelli Mozzi, who goes by 'Wolfie'.

The seven-year-old, who Beatrice refers to as a 'bonus child' is the son of Edoardo Mapelli Mozzi and his ex-fiancee Dara Huang.

Frederik Windsor's daughters,  Maud , 10, and Isabella, seven,  also attended.

Lord Frederik, who is married to Peep show actress Sophie Winkleman, is the son of Prince and Princess Michael of Kent, making him King Charles' second-cousin.

Missing from the festivities was Zara Tindall's children Mia, nine, Lena, five, and Lucas, two.   

 Lady Louise Windsor, 20, who is currently studying at St. Andrews University  and James, Viscount Severn, 15, also did not attend, however their mother the Duchess of Edinburgh was there.

Princess Eugenie's children August and Ernest may have been too young as they also did not attend, neither did Pippa Middleton's little ones.

The cousins all seem to bond during the evening, with Prince Louis sweetly blowing out his sister's candle at one point.

Princess Charlotte, Prince Louis and Prince George posted letters to other children before The 'Together At Christmas' Carol Service.

It had been put there at Kate's request so that members of the congregation could post handmade Christmas cards and letters to children less fortunate than themselves. 

But after the service, the mischievous royal blew out Charlotte's candle as their mother Kate laughed. 

He was pictured puffing his cheeks in an attempt to extinguish his older sister's candle, as she smiled.

He was pictured puffing his cheeks in an attempt to extinguish his older sister's candle, as she smiled.

George, ten, looked the spitting image of his father in a smart suit, while Louis, five, wore a navy button-up jacket, narrow-legged trousers and blue suede Chelsea boots. Charlotte, eight, was equally stylish in a £180 double-breasted burgundy wool coat from Trotters.

However, this is not the first time the Prince Louis, youngest of the Wales's children has stolen the show. 

The fourth in line to the throne has become the centre of attention on several occasions when at royal outings. 

When he took part in Trooping the Colour this year, the young royal had all eyes on him as he covered his nose and mouth in what is thought to be disgust, after he caught a whiff of horse excrement.

On the Coronation, Prince Louis melted hearts once again at Westminster Abbey as he was spotted cheering for his grandfather, King Charles, exclaiming: 'Yaaaay Say king. Yaaaay king,' lip reading expert Jacqui Press told Femail at the time.

However, the royal did not attend the Coronation concert as he was past his bedtime, this did not stop him from gaining attention online as fans of The Firm wondered where he was. 

Just days after the big event, he then got behind the controls of a JCB digger, as he sat on Prince William's lap whilst he moved the mechanical arm.

Many may remember when he covered his ears and appeared to scream next to the late Queen on the balcony of Buckingham Palace, due to the planes flying past. 

The service today, supported by The Royal Foundation, honoured those who work to support babies, young children and families in communities across the UK. 

Kate, who wore a white coat over a monochrome outfit, had travelled to the Abbey an hour earlier to check on arrangements.

Inside the Lady Chapel she met the performers, telling American singer Adam Lambert that she had been a 'big fan' of his performance at the Queen's Platinum Jubilee last year.

She also told how Charlotte was learning the piano and had watched British Grammy award-winning singer-songwriter Jacob Collier playing on YouTube.

Collier's performance of George Michael's song Last Christmas on John Lennon's old piano was the highlight of the night.

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. 

Also present were Kate's sister Pippa, the Duchess of Edinburgh and Princesses Beatrice and Eugenie. Pippa opted for a chic £450 tweed suit from Salvoni as she arrived at the Abbey accompanied by husband James Matthews.

Beatrice's seven-year-old stepson, Christopher Wolfe 'Wolfie' Mapelli Mozzi, wore a beige jacket with green trim and bronze buttons as he joined his parents at the event.

The Princess wore a £895 green wool tartan dress which is part of Belulah London’s Winter 2023 collection. 

Whereas her sister Eugenie wore a glamorous black ensemble with a £495 red leather handbag from designer Aspinal of London.

Sophie, 58, wrapped up against the winter chill in a blue Suzannah London wool coat, layered over a figure-skimming maxi dress, and a pair of £1,300 suede knee-high boots from Italian luxury shoe brand Gianvito Rossi.

The theme this year is Kate's 'early years' campaign, designed to highlight how important what happens to children from birth to the age of five is in shaping their development as adults. 

Among the 1,500 invited guests were parents, carers, early educators, midwives, health visitors and community volunteers who have either been nominated or personally invited by the princess.

Readings were delivered by Prince William, actors Jim Broadbent and Michael Ward, and TV presenter Emma Willis.

Lennon's piano, on which the former Beatle composed the song Imagine, was loaned by the estate of the late George Michael. The pop star, who died on Christmas Day 2016, had bought the piano for £1.45million in 2000.

The event at Westminster Abbey will be broadcast on Christmas Eve on ITV1 and ITVX.