Prince William is attending Royal Ascot without Kate Middleton after the Princess of Wales canceled her appearance at the last minute. All the details.

Kate, who shares three young children with William, has made a gradual return to public engagements this year since announcing in January that she is in remission from cancer. Kate has not shared details of the type of cancer with which she was diagnosed, though she has shared she underwent chemotherapy treatment.

As Prince William arrived at the event alone, a friend told Vanity Fair that the Princess of Wales has already been busier this year than previously expected.