The Duke and Duchess of Cambridge have congratulated Meghan Markle and Prince Harry on the birth of their baby girl Lilibet “Lili” Diana Mountbatten-Windsor . Prince William, 38, and Kate Middleton, 39, said they were "delighted" for the royal couple who welcomed their second child on Friday 4 June at Santa Barbara Cottage Hospital, California.The Duke and Duchess of Cambridge wrote: "We are all delighted by the happy news of the arrival of baby Lili.