Prince Louis wore an adorable tunic as Princess Charlotte twinned with mum the Princess of Wales as they arrived for their grandfather King Charles' Coronation.
The pair chererily smiled at wellwishers en route to Westminster Abbey from Buckingham Palace for the Coronation.
The two youngsters turned up at Westminster Abbey with dad Prince William as well as mum Kate, who decided to shun a tiara in favour of a floral headpiece.
As five-year-old Louis arrived for the big day, he wore an outfit made by Dege and Skinner which consists of a Hainsworth Garter Blue Doeskin Tunic with specially designed lace work embellishment to the collar, cuffs and fronts. The leg garment is black complete with Garter Blue stripe.
Last year, he stole the limelight with as he was spotted upturning his own nose with his thumb at his mum and wandering over to sit on Prince Charles's lap during the show after growing restless.
Meanwhile, Charlotte mirrored Kate in her own Alexander McQueen dress and cape in ivory silk crepe with ivory satin stitch embroidery featuring rose, thistle, daffodil and shamrock motifs to signify the four home nations.
She also wore a Jess Collett x Alexander McQueen headpiece silver bullion, crystal and silver thread work, similar to the one worn by her mother.
Older brother Prince George did not join his siblings as he arrived with the other boys who are taking on page of honour duties for both the King and Queen Camilla.
He and the other boys have been given the prestigious task of being pages of honour, which involves helping to carry the King Charles and Camilla's robes.
Meanwhile, William, Kate, Charlotte and Louis all made their way through the abbey, where they took their seats in the Lantern.
in the Coronation ceremony, although will no doubt be looking on with pride as William and George take part. William will pay homage to his father the King by pledging allegiance to him.
Appearing on his podcast The Good, The Bad and The Rugby last year, Mike Tindall was quizzed about his experience over the four-day celebration by his co-hosts James Haskell and Alex Payne.
As the co-hosts noted that the children were the "star of the show", Mike agreed, adding: "Louis was just wanting to have fun.
"And my two are always mischievous, so it was just trying to keep a lid on it. There were a lot of sweets out back though, so they had complete sugar-highs."
He added: "It was tough for them, they’re all young, asking them to sit in there from two until five is a long time. As any parent knows, you just do whatever needs to be done.”
After the ceremony all five of the Wales family will join the procession back to Buckingham Palace behind the gold state coach, where the route has been lined with wellwishers.
They will ride in a carriage, which will be followed by a series of other carriages carrying the likes of the new Duke and Duchess of Edinburgh as well as Lady Louise Windsor and James, the new Earl of Wessex.
In addition, the family will appear on the Palace balcony later where they will greet the huge crowds and enjoy the RAF flypast.
However, one royal relative that will not be joining them on the balcony is Prince Harry - who was hugely critical of brother William and sister-in-law Kate in his memoir Spare.
An insider claimed Harry will be "in and out of the UK in 24 hours" and that he won't attend the Coronation Concert at Windsor Castle tomorrow night either so he can get back to son Archie, who turns four today.
The ceremony is expected to end at 1pm today so it is believed that the Duke could head to the airport straight after, possibly leaving the country at around 2pm or 3pm.
