Tonight, Kate Middleton —Catherine, Princess of Wales—sparkled in a blue cape gown by Jenny Packham for a state banquet at Windsor Castle held in honor of German president Frank-Walter Steinmeier and his wife Elke Büdenbender.

Her dress wasn't the only thing that shone—she accessorized with the Oriental Circlet tiara, which was made in 1853 for Queen Victoria, and features more than 2,600 diamonds, paired with rubies, to create sparkling lotus flowers and Mughal arches. It marked Kate's first time wearing this tiara, which is believed to be her biggest yet.

WINDSOR, ENGLAND - DECEMBER 03: William, Prince of Wales and Catherine, Princess of Wales arrive ahead the state banquet for the German President Frank-Walter Steinmeier and his wife Elke Budenbender, on day one of their state visit

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