The Queen has praised the "family spirit" of the Welsh Guards as she presented new Colours to the regiment in its centenary year.
The Queen and the Prince of Wales, who is regimental colonel of the unit, honoured more than 300 troops gathered for the ceremony in the grounds of Windsor Castle.
They were joined by the Duke of Edinburgh and Duchess of Cornwall as the royal family eagerly await news of whether the Duchess of Cambridge has gone into labour.
Dressed in ceremonial red tunics and bearskins in the castle's quadrangle, it is the eighth time the 1st Battalion Welsh Guards has received new Colours, which are the regimental flags of the British Army.
The Queen will lead senior members of the royal family today as she presents new Colours to the 1st Battalion Welsh Guards celebrating its centenary year.
She will be joined by the Duke of Edinburgh, the Prince of Wales and the Duchess of Cornwall to honour the regiment during a ceremony at Windsor Castle.
The royal family, who are eagerly waiting news of whether the Duchess of Cambridge has gone into labour, will then attend a garden party at the castle with the regiment's soldiers and their loved ones.
The infantry units of the British army each have two Colours; the Queen's Colour, which is a union flag and symbolises the regiment's loyalty to the Crown, and a regimental Colour which has all the unit's battle honours inscribed on it.
The 1st Battalion Welsh Guards received its first Colours at Buckingham Palace from King George V in 1915. Its seventh and current pair was presented by the Queen at Windsor Castle in May 2006.
Charles has been regimental colonel of the Welsh Guards since 1975.
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The Duke and Duchess of Cambridge have unveiled a plaque and a painting by a local artist celebrating 50 years of the Valero oil refinery in Pembrokeshire.
The Royal couple were also presented with a model Valero fuel truck as a gift for Prince George.
The Duke and Duchess of Cambridge are in Pembrokeshire this morning, visiting the Valero oil refinery.
Kate and William will then head to Cardiff to watch Wales play Australia this afternoon.
Crowds are gathering in Pembrokeshire for the visit of the Duke and Duchess of Cambridge today.