Kate Middleton didn't wear her engagement ring that once belonged to Princess Diana at the Royal Marsden Hospital in London on Jan. 14. Inside why and more about Princess Kate's new ring.

Everyone just noticed that Kate Middleton isn't wearing her engagement ring...here's what we know about why she ditched the iconic sapphire.

The Princess of Wales made a surprise return to the Royal Marsden Hospital to personally thank staff who looked after her during her cancer treatment on Tuesday. At such a critical moment in US history, we need reporters on the ground. Your donation allows us to keep sending journalists to speak to both sides of the story.

Kate Middleton visited the Royal Marsden Hospital in London on Tuesday, Jan. 14, where she received chemotherapy treatment after her cancer diagnosis last year. See all the photos here

Princess Catherine just made her first royal outing of the year—and this one hits pretty close to home. Earlier today, Kate Middleton paid a visit to The Royal Marsden, which happens to be the same cancer treatment center where she received her chemotherapy treatments following her cancer diagnosis.

Middleton’s famous 12-carat diamond and sapphire engagement ring (you know, the one that used to belong to Prince William‘s late mother, Princess Diana) was MIA. And yes, this

Princess Kate made her first solo official appearance in more than a year as she visited the Royal Marsden Hospital in London to thank staff for her care

Kate Middleton just became an official patron of the hospital where she received preventative chemotherapy treatment, marking her first royal engagement of the year. During the outing, Kate visited with patients at the Royal Marsden Hospital,