Prince William, Kate Middleton honor 13th anniversary with never-before-seen wedding photo amid her cancer battle

Kate Middleton and Prince William celebrated their 13th wedding anniversary.@KensingtonRoyal/Millie Pilkington

Prince William and Kate Middleton are celebrating 13 years as husband and wife.

The couple honored their wedding anniversary Monday with a never-before-seen wedding photo shared to their joint Instagram account.

They captioned the smiling black-and-white snap, “13 years ago today!”

The couple shared a never-before-seen wedding snap. Getty Images They walked down the aisle in April 2011. Getty Images

In the throwback shot, the Prince of Wales, now 41, stood behind his bride with his hand on her waist as she clutched a bouquet.

Middleton, now 42, wore an Alexander McQueen gown as she walked down the aisle at Westminster Abbey in London.

The Princess of Wales has since given birth to three children: Prince George, 10, Princess Charlotte, 8, and Prince Louis, 6.

The bride wore an Alexander McQueen gown. Getty Images The milestone moment comes amid Middleton’s cancer battle. Chris Jackson/WPA Pool/Shutterstock

She is currently undergoing chemotherapy after being diagnosed with cancer.

The disease was discovered when Middleton underwent abdominal surgery in January, but she waited until March to update the public.

“William and I have been doing everything we can to process and manage this privately for the sake of our young family,” she explained in her announcement last month. “It has taken us time to explain everything … in a way that is appropriate for them.”

The Princess of Wales shared her diagnosis last month. via REUTERS She stepped back from the public eye in January after abdominal surgery. Getty Images

The disclosure came amid rampant speculation about Middleton’s well-being after she stepped back from the spotlight in January and released a Photoshopped picture on Mother’s Day two months later.

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When she was subsequently photographed with William at a farm stand, many were convinced a body double was used, including Bravo exec Andy Cohen.

The “Watch What Happens Live” host, Blake Lively and more A-listers have since apologized for their conspiracy theories.

Middleton kept the news private while helping her children “process” the news. She and William share Prince George, Princess Charlotte and Prince Louis. Samir Hussein/WireImage

As for how William and Middleton are spending their special day amid her cancer battle, The Post reported that the future king plans to “rustl[e] up a decent meal in candlelight.”

William and Middleton married in April 2011, six months after their engagement.

The duo started dating in 2002 upon meeting at St. Andrews University.