Kate Middleton had all eyes on her when she wore a plunging V-neck Marchesa rose gown at a state banquet Wednesday for visiting royals King Felipe and Queen Letizia of Spain at England’s Buckingham Palace.

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The 35-year-old Duchess of Cambridge completed her look with a ruby encrusted diamond necklace owned by Queen Elizabeth II, as well as the Lover’s Knot tiara previously worn by Princess Diana.

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Middleton and husband Prince William, 35, share two children: 3-year-old Prince George and 2-year-old Princess Charlotte.

ETOnline reported the event will most likely be Prince Philip’s final public dinner. The 96-year-old’s retirement from public duties will go into effect this fall.