Kate Middleton and Prince William celebrated St. David's Day, a Welsh national holiday.

They paid tribute to the Welsh Guards during the St. David's Day Parade in Windsor.

Prince William visited the Welsh Guards for the first time since becoming ceremonial Colonel.

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

The ceremony ended with Prince Charles saluting the troops as they marched by.

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

This is similar to Kate's annual St. Patrick's Day duty.

The royal couple's Wales-themed week included the event.

Wales is dear to William and Kate because it is where they lived as newlyweds and first-time parents.