“As I looked right, there was the Queen two or three feet from me.
“She was staring right at me because I was looking the wrong way.
“So I was like, ‘sorry ma’am’. It was quite funny actually.”
The Duke and Duchess of Cambridge will celebrate their 10th wedding anniversary on April 29 this year.
It has not been confirmed as of yet how they will mark the occasion.
Last year, the official Kensington Palace Instagram account shared a photo from the day.
They also thanked the public for congratulatory messages.
The caption read: “Nine years ago today – thank you for all your lovely messages on The Duke and Duchess of Cambridge’s wedding anniversary!”