The Duke and Duchess of Cambridge looked relaxed and happy as they shared a joke with runners in Anglesey.
Wearing a tweed jacket and slim black trousers the Kate laughed as she met some of the runners and their families and volunteers before the start of the ultra marathon.
Prince William and the Duchess of Cambridge have arrived in Anglesey to start an ultra marathon, it marks the first time Kate has been on a public engagement since the birth of Prince George.
The Duchess of Cambridge's decision to join her husband at the launch of an ultra-marathon today was a surprise and her attendance was only revealed this morning.
The royal couple have lived on Anglesey for years and have always spoken of their love of the island.
William said a public goodbye a fortnight ago as he confirmed his young family would be leaving their Welsh home and moving "elsewhere" when his posting comes to an end this month, having completed his three-year tour as an RAF search and rescue helicopter pilot based at RAF Valley on Anglesey.
The Duke of Cambridge is making one of his final public engagements on Anglesey as the new father's time on the island comes to an end.
William will be joined by Kate as he starts the gruelling, three-day annual "ultra" marathon run around the coast of the island, known as the Ring O' Fire.
The Duke and Duchess will meet some of the runners and their families and volunteers before the start - but the couple will not be bringing the royal baby.
The annual event is a 135-mile foot race around the rugged coast of Anglesey, staged over three days and including 13,695 feet of ascent.
The last time the Duchess was seen in public was the day after the birth of Prince George.
The Duchess of Cambridge will join Prince William when he starts the Anglesey ultra marathon today.
But the royal couple will appear without Prince George.