THE HAGUE, Netherlands (AP) — The heir to the Dutch throne, Princess Amalia, was recovering in a hospital Wednesday after undergoing surgery to one of her arms that she broke a day earlier when she fell off her horse, the Royal House announced.The 21-year-old, formally known as the Princess of Orange, sustained the injury on Tuesday and underwent surgery the same evening at the University Medical Center Utrecht hospital, according to a Royal House statement.Princess Amalia is recovering after falling off a horse earlier this week. via Associated Press“The operation went well. She will remain at the UMC Utrecht for monitoring at least until tomorrow,” the statement said.Amalia revealed in a book written about her by a popular Dutch comedian that she is a keen horseback rider.Close