Monaco has celebrated National Day since 1734. While the actual date of celebration has rotated through the years, in correlation with the day of the reigning Sovereign Prince's patron saint, Prince Albert chose to honor it on Nov. 19 like his late father, Prince Rainier, did as the sovereign of Monaco.

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.

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.

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

Princess Charlene of Monaco delighted her fans on Tuesday, Nov. 19 by wearing her precious and usually absent engagement ring. To commemorate Monaco's National Day, which is also know known as the Sovereign Prince's Day,

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

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

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.

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.