Kate Middleton wore her later mother-in-law Princess Diana's tiara again.

On Wednesday, the Duke and Duchess of Cambridge joined Queen Elizabeth II and Prince Philip in a state banquet at Buckingham Palace. The event was put on for King Willem-Alexander and Queen Maxima of the Netherlands.

In the photos shared by Express, Middleton arrived in an elegant blue Alexander McQueen gown that flattered her trim figure. The dress features think straps and a figure-hugging bodice. The duchess accessorized her get up with Princess Diana's Cambridge Lovers Knot tiara. She also wore teardrop pearl earrings and a diamond and pearl necklace, which was once owned by the Queen Mother.

According to the publication, it wasn't the first time Middleton wore the headpiece. In fact, it was the third time she used it.

Middleton is popular for using the same style that works for her. In fact, the Duchess of Cambridge has made a name for recycling dresses. However, aside from reusing her outfits, the royal mom of three is a huge fan of a particular jewelry brand.

According to Harper's Bazaar, Middleton only turns to Kiki McDonough when it comes to intricate earrings to pair for her dresses. Prince William's wife was photographed using different jewel from McDonough's collection including its lemon quartz pear and oval drop earrings, Grace white topaz stud, Morganie double drop, and Lauren yellow gold pave diamond leaf to name a few.

When it comes to choosing her outfits, Middleton knows well what compliments her. According to Dr. Anna Akbari, an author and former professor at NYU and Parsons who specializes in the sociology of style and self-presentation, Middleton's fashion is "pretty timeless and hard to critique."

"She's mastered that look, and it suits her. Imagining Meghan Markle in the same style would feel forced—she's never been preppy, so it would be weird to see her fully embracing that." Akbari explained.

In related news, Middleton might be the next queen mother. According to Emily Hodgkin, Middleton will be a queen mother if she is a dowager, the widow of a king. The Duchess of Cambridge is set to be a queen consort when Prince William takes over the crown. If in case, her husband passes away and her son becomes the next king, she will still hold the title of the queen, but at that time she will be a queen mother and not a queen consort.

Kate Middleton
Kate Middleton wears Princess Diana's diamond tiara for the third time at Buckingham Palace. Pictured: Middleton attends a State Banquet in honour of King Willem-Alexander and Queen Maxima of the Netherlands at Buckingham Palace in London on Oct. 23, 2018, on the first day of the Dutch King and Queen's two-day state visit. Getty Images/John Stillwell