Kate Middleton and Prince William observed St. David's Day, a national holiday in Wales.

During the St. David's Day Parade in Windsor, they paid tribute to the Welsh Guards.

Prince William paid his first visit to the Welsh Guards since becoming ceremonial Colonel.

During a traditional St. David's Day march, William and Kate presented leeks to the regiment's commanders and guardsmen.

The ceremony concluded with the Prince of Wales saluting the troops as they marched by.

In the United Kingdom, William and Kate met regiment families and 5th Royal Australian Regiment (5RAR) personnel.

This event is reminiscent of Kate's annual St. Patrick's Day duty.

The event was part of the royal couple's Wales-themed week.

Wales holds a special place in William and Kate's hearts because it is where they lived as newlyweds and first-time parents.