Princess Charlotte shares a laugh with big brother George during surprise visit to Wales

Watch: Princess Charlotte playfully attempts to conduct orchestra in Wales

Prince George and Princess Charlotte joined their parents for a surprise visit to Wales on Saturday.

The Duke and Duchess of Cambridge and their two eldest children arrived at Cardiff Castle to meet performers and crew staging a Jubilee show on Saturday afternoon.

It was George, eight, and seven-year-old Charlotte's first official visit to Wales but younger brother Prince Louis, four, missed out this time.

Photos showed the two young royals seemingly nervous at the start of their visit.

But they soon became more at ease, with Charlotte spotted laughing as she conducted a band while the family met those involved in the concert.

She was offered a chance to lead the orchestra in a rendition of We Don’t Talk About Bruno from the Disney film Encanto.

As the musicians burst into tune, Charlotte beamed, turning to her mother Kate excitedly.

Read more: Prince Louis steals the show as royals gather for Platinum Jubilee balcony appearance

George took the lead in the technical booth, taking full advantage of the opportunity to play with the sound and lighting decks by asking what all the buttons mean.

The royal family joked and smiled as they took turns with the various switches, laughing as the young prince chose to turn the volume up high.

Often encouraging his younger sister to take part, George could also be seen leaning on her shoulder as they watched the Wales Youth Choir for Good practice.

William and Kate and their children also watched rehearsals and met some of the acts taking part in the celebrations, including Welsh singer Bonnie Tyler.

Bonnie was made an MBE in the Queen’s Birthday Honours last week for her services to music.

The royals also met weatherman Owain Wyn Evans, known for his role on the nightly news programme North West Tonight and The One Show.

The Cambridges and their children were then introduced to several West End performers, Rubicon Dance Company and the Wales Youth Choir for Good.

When asked by members of the public where Louis was, William said he is too young for such visits, saying: “He’s still only four.”

Read more: Royals, dignitaries, and NHS workers attend service of thanksgiving for the Queen

William will be dashing back to London for BBC’s open-air show, staged in the front of Buckingham Palace on Saturday evening.

The Duke of Cambridge and his father, the Prince of Wales, are to take to the stage to pay public tributes to the Queen during the star-studded Jubilee concert.

The father and son – both future kings – will speak separately in honour of the monarch towards the end of the show.

It is thought unlikely the Queen will attend the concert but confirmation of any movements will be released on the day.

The Queen, 96, who has been facing ongoing mobility problems, pulled out of attending the service of thanksgiving at St Paul’s Cathedral on Friday after experiencing discomfort following two balcony appearances and a beacon lighting on Thursday.

Watch: Prince George and Princess Charlotte delight crowds with surprise Jubilee visit to Cardiff

At a reception at London’s Guildhall on Friday, the Duchess of Cambridge is said to have told an attendee the Queen is “fine” but had found the day “very tiring”.

Gill Smallwood, from Bolton, spoke with Kate and asked how the Queen was doing.

Smallwood said: “She (Kate) said ‘yes, she was fine, it was just very tiring yesterday, and she (the Queen) had had a lovely, lovely time’.”

She added Kate said George, Louis and Charlotte also “had a lovely time” at Thursday’s celebrations, during which all three Cambridge children appeared on the Buckingham Palace balcony.

A Cardiff University poll recently found 55% of people support having a monarchy, with 28% preferring an elected head of state.

A YouGov survey also revealed that the Queen remains the most popular royal.

The poll showed eight in 10 Britons hold a positive opinion of the monarch, versus 12% who see her negatively – giving her a net score of +69.

The survey showed that 77% of the public think the Duke of Cambridge will do a good job as king, compared to 57% for the Prince of Wales.

William is seen as a good role model by seven in 10 Britons, while only three in 10 think the same of his brother Harry.