Prince Harry pulled off a grand surprise on Prince William and Kate Middleton’s wedding day that shocked the couple.

Katie Nicholl wrote in her 2017 biography, “Harry: Life, Loss, and Love,” that Meghan Markle’s husband prepared a sweet surprise for his brother and sister-in-law on their big day after their famous Buckingham Palace balcony kiss. Prince Harry had apparently already warned Prince William that he had a “surprise in store” for them before it happened. However, the Duke and Duchess of Cambridge were still shocked because they reportedly did not expect the things he had prepared for them.

“Harry had arranged for the newly-weds to make the short drive back to Clarence House in his father’s beloved open-topped Aston Martin Volante,” the author wrote.

“When William and Kate saw that the car had been decked out in balloons, red white and blue streamers, and a JU5T WED number plate, they were delighted,” Nicholl continued.

Prince William and Middleton later returned to Buckingham Palace for their wedding breakfast for 300 guests and reception that Prince Harry and Middleton’s sister, Pippa Middleton, prepared. The Duke of Sussex was in charge of transforming the Throne Room into a nightclub.

“Harry happily took on the role for master of ceremonies and made sure everyone was having a great time,” Nicholl wrote, adding that Prince Harry also “stage-dived” into the throng of revelers during the celebration.

In the same book, Nicholl revealed that following Prince William and Middleton’s wedding, Prince Harry was reportedly left “bitter and lonely” when the couple decided to move to Norfolk. Markle’s husband felt that he had lost his partners in crime, especially his big brother, Prince William. Also, he was very close to his sister-in-law, who filled “some of the emotional voids in his life.”

At the moment, rumors claimed that there is some tension between Prince William and Prince Harry, who will be splitting their shared household in the coming weeks. The reports weren’t a big surprise as months ago, there were already claims that the Duke of Cambridge and Duke of Sussex were considering a formal division because they no longer rely on each other and both have a growing family.

Prince William, Kate Middleton and Prince Harry
Prince Harry shocked Prince William and Kate Middleton when he successfully pulled off this surprise on their wedding day. Pictured: Prince William, Middleton and Prince Harry during 'The Patron's Lunch' celebrations for The Queen's 90th birthday at The Mall on June 12, 2016 in London. Getty Images/Jeff Spicer