The wedding of Prince William and Kate Middleton was a spectacle: millions of people around the world watched the ceremony live.

While it was easy to be awestruck by the splendor of the ceremony and Kate’s stunning Alexander McQueen dress, many may have missed the secret question the bride asked her groom immediately after their marriage vows.

As the newlyweds boarded their “single-decker carriage,” she turned to him and asked William a three-word question, according to royal biographer Robert Jobson.

He wrote in his book: Catherine: The Princess of Wales: The Biographythat Kate looked at him and asked: “Are you happy?”

William responded heartwarmingly: “It was incredible. I am so proud that you are my wife.”

Prince William and Kate met while studying art history at St. Andrew’s University and soon fell in love. After years of dating, William proposed to her during their trip to Kenya.

The current Prince and Princess of Wales married on April 29, 2011 in Westminster Abbey. Their first child, George, was born in 2013, followed by Charlotte in 2015 and Louis in 2018.

Kate, who recently announced her shock diagnosis, praised her “supportive” husband for what have been “an incredibly difficult last few months for our whole family.”

In her health update, she said: “Having William by my side is a great source of comfort and reassurance.”