Princesses Catharina Amalia and Elisabeth steal the show as Luxembourg royal family gather for royal abdication - best photos

Leading the royal arrivals was Princess Catharina-Amalia, who was a vision wearing a striking ruby red gown, complete with a signature cape. Oozing royal glamour, the Princess of Orange, 21, kept true to her autumnal rouge colour palette, pairing her look with red pointed-toe stilettos. The royal, who studies at the University of Amsterdam, completed her look with an elegant clutch bag in the same shade, adorned with jewels. 

Catharina was joined by , Princess Elisabeth, 23, who, in tune with Catharina's autumnal red, opted for a stylish navy blue boat-neck gown. The silk number was impeccably flattering, hugging the royal's trim waist. Elisabeth, who is also known as the Duchess of Bradbant, added a pair of striking drop-silver earrings made up of glittering diamonds.

Shortly after arriving, the royal pair were photographed demonstrating their incredible curtsies to the Grand Duke and Duchess. Both Catharina and Elisabeth gave a deep, respectful gesture, with the Grand Duchess Maria affectionately holding their arms.

The Princesses were photographed attending the royal milestone alongside Catharina's parents, Queen Maxima and King Willem Alexander of the Netherlands. Maxima looked impeccable, choosing a silk khaki green gown for the occasion, which she paired beautifully with an oatmeal-hued coat. As for accessories, the royal, 54, added a pair of stylish khaki green gloves and suede pointed-toe stilettos to match.
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They were also joined by the Grand Duchess Maria Teresa, who almost matched Catharina, opting for a sophisticated cape-style dress in an elegant berry shade. Meanwhile, the Grand Duke was dressed in his khaki military uniform with honours and decorations.

As they entered the Grand Ducal Palace, Princess Stephanie's impeccable gown was finally unveiled, the future Duchess wearing a striking pale blue gown, which featured a beaded corset-style top and free-flowing skirt with a matching cape-like feature on her shoulders. Her royal look was complete with a glittering tiara and official orange sash.

Following the swearing-in ceremony, Grand Duke Guillaume and Grand Duchess Stephanie appeared on the balcony of the Grand Ducal Palace, with their two young sons, Prince Charles, five, and Prince Francois,  two.

The new Grand Duke and Duchess were all smiles at the swearing in ceremony.

The new Grand Duke and Duchess changed their outfits before they arrived at City Hall. Guillaume changed into a suit and tie, while Stephanie slipped into a cream dress with asymmetric shoulder and cape detailing.

Grand Duke Guillaume's sister, Princess Alexandra, is just weeks away from expecting her second child. 

The Grand Ducal Court announced in May that Alexandra and her husband, Nicolas Bagory, will welcome a baby this autumn.

Both Catharina and Elisabeth took time away from their studies. Elisabeth  is currently studying at Harvard.