Buckingham Palace says Princess Anne has sustained minor injuries and concussion following an incident on the Gatcombe Park estate on Sunday.

The 73-year-old sister of King Charles III has been hospitalized as a precautionary measure for observation and is expected to make a full recovery.

“The King has been kept closely informed and joins the whole royal family in sending his fondest love and well-wishes to The Princess for a speedy recovery,’’ the palace said in statement on Monday.

It gave no other details.

Anne is one of the hardest working members of the royal family, having stepped in and taken more duties in light of Charles’ cancer diagnosis.

It’s understood that Anne, the only daughter of the late Queen Elizabeth II, had been walking in the grounds of her estate when she suffered the minor injuries to her head.

It’s believed there were horses in the vicinity and that her injuries were consistent with impact from a horse’s head or legs.