It was a glamorous night for the British royal family, where everyone got to dress the part of their regal titles by donning gowns, sashes and tiaras.

All eyes were especially drawn to Kate, the Duchess of Cambridge, as she arrived Thursday evening for the annual diplomatic reception at Buckingham Palace in a royally red Jenny Packham dress, the same one she wore to an equally formal banquet last year.

But this time, it wasn’t her gown or even her hair that drew attention, it was what she wore on top of her head: the Cambridge Lover’s Knot tiara, the signature headpiece that belonged to her late mother-in-law, Princess Diana.

Kate, the Duchess of Cambridge, arrives for the diplomatic dinner at Buckingham Palace. Tim Rooke/REX/Shutterstock

Kate, the Duchess of Cambridge, arrives for the diplomatic dinner at Buckingham Palace. Tim Rooke/REX/Shutterstock

Queen Elizabeth gave the pearl-and-diamond tiara as a wedding gift to Diana in 1981. The princess was known to complain, however, that the tiara’s weight often gave her headaches.

Princess Diana wearing her signature Cambridge Lover's Knot Tiara. Tim Graham / Getty Images

Princess Diana wearing her signature Cambridge Lover’s Knot Tiara. Tim Graham / Getty Images

Read more about the royal affair at TODAY.

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