Tiara Alert! Pregnant Kate Middleton Wears Princess Diana's Favorite Tiara at White-Tie Palace Party
PEOPLE.com -

Kate Middleton sparkled in diamonds as she and Prince William stepped out for the annual winter party at the palace Tuesday.

The royal couple, who are expecting their third child in April, left children Prince George and Princess Charlotte at home to attend Queen Elizabeth’s reception for diplomats at Buckingham Palace. It is one of the largest parties the queen hosts each year.

Kate was pictured being driven into the palace wearing the Queen Mary’s Lover’s Knot tiara (often also called the...

In related news