Kate Middleton will be queen in the near future when Prince William finally takes over the throne and becomes king. However, while she doesn't have the official title yet, Middleton has already been looking like a queen since her first day as a royal.

Last December, Middleton looked every inch the queen when she attended the Queen's Diplomatic Corps Reception at Buckingham Palace. For the event, she wore one of her favorite headpieces, the Cambridge Lover's Knot Tiara, which her late mother-in-law Princess Diana also frequently wore. The tiara, which was made by high-end jeweler Garrand for Queen Mary in 1914, has an array of diamonds and 19 hanging pearls set in silver and gold. Giving her the full regal effect was her gorgeous Jenny Packham gown.

Kate Catherine, Duchess of Cambridge greets guests at an evening reception for members of the Diplomatic Corps at Buckingham Palace on December 04, 2018 in London, England. Approximately 7,500 military personnel are currently serving overseas at Christmas. Photo: Getty Images/Victoria Jones

In October last year, Middleton also seemed to embody her future role as queen when she attended the state banquet at Buckingham Palace to honor King Willem-Alexander and Queen Maxima of the Netherlands. The Duchess of Cambridge looked gorgeous in her ice blue Alexander McQueen gown.

At the time, she also wore the Lover's Knot Tiara, which she paired with teardrop pearl earrings and a diamond and pearl necklace, Harpers Bazaar noted. Her necklace was an heirloom as well as it was once worn by Queen's Elizabeth II's mother.

Kate Britain's Catherine, Duchess of Cambridge, attends a State Banquet in honour of King Willem-Alexander and Queen Maxima of the Netherlands at Buckingham Palace in London on October 23, 2018, on the first day of the Dutch King and Queen's two-day state visit. Photo: Getty Images/John Stillwell

Of course, Middleton has been looking like a queen since day one. During her 2011 royal wedding with Prince William, she stunned in her beautiful lace Alexander McQueen dress that was designed by the fashion house's creative director, Sarah Burton. Middleton's gown had long lace sleeves, a v-neckline and a long train. It was so iconic and impactful that H&M even designed a more affordable version of it that costs $299.

As for her headpiece, Middleton wore a tiara that Queen Elizabeth II originally received when she turned 18, according to Harpers Bazaar. Called the Cartier Halo Scroll tiara, it has almost 1,000 diamonds. It was originally purchased by King George IV and given as an anniversary gift to his wife in 1936.

Want to see more of Middleton wearing tiaras and looking like a queen? Check out the photos below!

Kate Chinese President Xi Jinping and Catherine, Duchess of Cambridge attend a state banquet at Buckingham Palace on October 20, 2015 in London, England. The President of the People's Republic of China, Mr Xi Jinping and his wife, Madame Peng Liyuan, are paying a State Visit to the United Kingdom as guests of the Queen. They will stay at Buckingham Palace and undertake engagements in London and Manchester. The last state visit paid by a Chinese President to the UK was Hu Jintao in 2005. Photo: Getty Images/Dominic Lipinski

Kate Catherine, Duchess of Cambridge attends a dinner hosted by Her Majesty's Ambassador to France, Edward Llewellyn, at the British Embassy in Paris, as part of their official visit to the French capital on March 17, 2017 in Paris, France. Photo: Getty Images/Dominic Lipinski