Credit: Getty Images Prince Albert of Monaco and his wife, Princess Charlene, stepped out in style to celebrate the country's National Day on Tuesday, Nov. 19, but it was their 9-year-old twins that truly stole the show. Prince Jacques—who will one day ...

It's Monaco's National Day—the day set aside to celebrate the principality's ruler, Prince Albert, which is widely considered the banner day of the Monegasque royal calendar—and the royal family marked the occasion with all of the fanfare you might expect.

Monaco's National Day was celebrated on Tuesday in the presence of Prince Albert II and his wife Princess Charlene.

Prince Albert and Princess Charlene joined their twin children on the Monaco Palace balcony today for a historic occasion. Today marks Monaco's National Day, and Charlene, 46, and Albert, 66, attended a Thanksgiving mass at the Cathedral of Monaco to celebrate.

The Monaco royal family stepped out in style to celebrate the principality's National Day today. The parents, Prince Albert and Princess Charlene, adorably chose to match with their twins Prince Jacques and Princess Gabriella on the occasion.

Princess Charlene attended with her husband Prince Albert and their twins Prince Jaques and Princess Gabriella

Princess Charlene was joined by Prince Albert, Prince Jacques, Princess Gabriella, Princess Stephanie of Monaco, and Princess Alexandra of Hanover for the glamorous display of royal pomp and ceremony

Princess Charlene and Princess Gabriella of Monaco are celebrating the principality's National Day in mother-daughter style that's totally très chic. On Nov. 19, Princess Charlene, 46, and Princess Gabriella,