Kate Middleton and Prince William marked their 13th wedding anniversary on Monday with a sweet new photo of the couple.

“13 years ago today!” the couple said in a caption on their shared Instagram account.

The black-and-white photo was captured by photographer Millie Pilkington.

Pilkington also commented on the photo and wrote, “Happy wedding anniversary! Can’t believe it’s been 13 years. Remember this moment so well. Sending you both much love on this special day.”

The Prince and Princess of Wales were married in front of nearly 2,000 guests on April 29, 2011, at Westminster Abbey.

The new picture comes amid a trying time for the couple, as the Princess of Wales shared in March that she was diagnosed with cancer.

“This, of course, came as a huge shock, and William and I have been doing everything we can to process and manage this privately for the sake of our young family,” the royal said in a video announcing her diagnosis.

“As you can imagine, this has taken time. It has taken me time to recover from major surgery in order to start my treatment,” Kate said, referencing the abdominal surgery she underwent in January. “But, most importantly, it has taken us time to explain everything to George, Charlotte and Louis in a way that is appropriate for them, and to reassure them that I am going to be OK.”

Kate’s health news comes amid King Charles’ own cancer diagnosis, which Buckingham Palace announced on Feb. 5.

Neither Kate nor Charles have released what kind of cancer they have, or the severity.

Charles is set to step out for his first official public engagement in some time on Tuesday, the palace announced last week.

“To help mark this milestone, The King and Queen will make a joint visit to a cancer treatment centre next Tuesday, where they will meet medical specialists and patients,” the palace said on Friday, adding that, “This visit will be the first in a number of external engagements His Majesty will undertake in the weeks ahead.”