She hasn't worn a tiara since her wedding, but the Duchess of Cambridge has stepped up the glamour for a white-tie ball at Buckingham Palace - and she's making it a family affair.
The diamond-encrusted tiara perched on Kate's half-up hair is said to belong to the Queen Mother and Princess Margaret, and is reportedly on loan to the princess by the Queen.
Kate, 31, paired the tiara with a pair of bejeweled chandelier earings and a white Alexander McQueen dress, a sliver of which was visible as she arrived in a chauffered Bentley to the Diplomatic reception - the same event at which Princess Margaret donned the lotus-flower tiara 55 years ago!
One of the biggest events on the royal calendar, this formal affair is hosted by the Queen and allows her the opportunity to spend time with all 172 foreign diplomats based in London.
It seems Prince William, 31, and Kate might be learning the ropes as the future monarchs will one day be hosts of the event.
William and Kate have been stepping out quite a bit lately without 3-month-old Prince George and have a busy schedule leading up to Christmas.