Kate Middleton made her first black-tie appearance as the Princess of Wales

Kate Middleton is making her tiara debut as the Princess of Wales!

The fashionable royal, 40, sported her first tiara in nearly three years for Tuesday's state banquet held at Buckingham Palace. The banquet was held as part of the first state visit of King Charles III's reign, welcoming the President of South Africa, Cyril Ramaphosa, to the U.K.

For the elegant evening, Princess Kate wore a white gown by Jenny Packham paired with her go-to headpiece for such occasions: Queen Mary's Lover's Knot tiara.

With pearls hanging from diamond knots, the tiara was also a favorite of her mother-in-law, Princess Diana. According to the Court Jeweller, the stunning sparkler is more than a century old and was originally commissioned from the jeweler Garrard by Queen Mary in either 1913 or 1914.

It is a replica of a tiara owned by Mary's grandmother, Princess Augusta of Hesse, the Duchess of Cambridge. She was accompanied by her husband, Prince William to the event.