Kate Middleton Stuns in Princess Diana's Favorite Tiara

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Kate Middleton gorgeously channeled her late mother-in-law, Princess Diana, when the 33-year-old Duchess of Cambridge donned one of her favorite tiaras at a royal engagement.

Kate wore the show-stopping Cambridge Lover's Knot tiara at the annual Diplomatic Reception at Buckingham Palace on Tuesday night, which Diana had been photographed wearing on multiple occasions.

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Previously, Kate's been known to sport the Lotus Flower tiara, a favorite of Queen Elizabeth's. The stylish royal wore that particular tiara in October at her first state dinner (in honor of the president of China), and again at the 2013 Buckingham Palace reception for diplomats -- the same event she attended on Tuesday night.

Curiously, Kate wore the exact same dress -- a baby blue lace Alexander McQueen gown -- and the exact same pair of diamond earrings at the 2013 event, highlighting her recent change in tiaras even more.

Check out Kate's look in 2013:

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Watch the video below to revisit Kate's bold red Jenny Packham gown and stunning tiara look in October.