Kate Middleton Is Breathtaking in Blue for Queen Elizabeth’s 90th Birthday Celebration

The Duchess stole the show at the royal service!

Kate Middleton, her husband Prince William and brother-in-law Prince Harry attended a special service at St. Paul’s Cathedral in London today (June 10, 2016) to formally commemorate Queen Elizabeth II’s 90th birthday.

The Duchess of Cambridge chose a regal, pale blue dress by Catherine Walker for the event. She also wore her hair in a loose bun under a white pillbox hat.

The trio were joined at the event by Prince Charles and Camilla, the Duchess of Cornwall, Princesses Beatrice and Eugenie of York, and Prime Minister David Cameron.

Check out a gallery of the Duchess’s look above!