Taken by famed photographer Mario Testino, the image shows the couple casually dressed in similar matching white shirts and grinning from ear-to-ear as they get ready to walk down the aisle.
The picture is featured in William and Kate's wedding program, which was released on Thursday and includes the following message from the soon-to-be married duo.
"We are both so delighted that you are able to join us in celebrating what we hope will be one of the happiest days of our lives," it reads. "The affection shown to us by so many people during our engagement has been incredibly moving, and has touched us deeply. We would like to take this opportunity to thank everyone most sincerely for their kindness."
It's signed "William and Catherine."