After weeks of global speculation about her whereabouts and recovery from surgery in January, Kate Middleton, the Princess of Wales, reveals she has been diagnosed with cancer and is undergoing chemotherapy.

In a video released Friday, she says she began chemotherapy in late February after recovering from her “major abdominal surgery.” Though the type of cancer hasn’t been disclosed, she is currently in treatment alongside her father-in-law, King Charles, who is also undergoing cancer treatment.

In her video, Kate said of her surgery, “at the time, it was thought that my condition was non-cancerous.” Unfortunately, tests showed that cancer had been present and she was advised to undergo a course of preventative chemotherapy as a result.

“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,” Kate says in the video, which was filmed at Windsor Castle earlier this week. “As you can imagine, this has taken time. It has taken me time to recover from major surgery in order to start my treatment.”

The mother of three also mentioned her children in her statement.

“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,” she says. “As I have said to them; I am well and getting stronger every day by focusing on the things that will help me heal; in my mind, body and spirits.”

Earlier this year, a statement from Kate’s team at Kensington Palace assured the public that she was expected to make a full recovery, but wouldn’t be likely to resume her public duties until after Easter.

“We hope that you will understand that, as a family, we now need some time, space and privacy while I complete my treatment. My work has always brought me a deep sense of joy and I look forward to being back when I am able, but for now I must focus on making a full recovery,” Kate says. “I am also thinking of all those whose lives have been affected by cancer. For everyone facing this disease, in whatever form, please do not lose faith or hope. You are not alone.”