Royalty

In this photo made available by Kensington Palace from the personal photo album of the late Diana, Princess of Wales, shows the princess and Prince Harry on holiday, and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy.' Prince William and Prince Harry will pay tribute to their mother, Princess Diana, as the 20th anniversary of her death in a car crash approaches in a TV documentary “Diana, Our Mother: Her Life and Legacy” which will air Monday July 24, 2017 on British TV. (The Duke of Cambridge and Prince Harry/Kensington Palace via AP) NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements).

Children welcome Britain's Kate, the Duchess of Cambridge, during her visit with Britain's Prince William, in front of the presidential palace, in Warsaw, Poland, Monday, July 17, 2017. The Duke and Duchess of Cambridge and their children arrived in Poland on Monday, on the first leg of a goodwill trip to two European Union nations that seeks to underscore Britain's friendly ties despite its negotiations to leave the bloc. (AP Photo/Alik Keplicz)

Children welcome Britain's Kate, the Duchess of Cambridge, during her visit with Prince William in front of the presidential palace, in Warsaw, Poland, Monday, July 17, 2017. The Duke and Duchess of Cambridge and their children arrived in Poland on Monday, on the first leg of a goodwill trip to two European Union nations that seeks to underscore Britain's friendly ties despite its negotiations to leave the bloc. (AP Photo/Alik Keplicz)

FILE - A Friday, Sept. 5, 1997 aerial photo taken from files of the island where Princess Diana is buried in the grounds of the Spencer family estate in Althorp, England, near Northampton north of London. Prince William, his wife, Kate, and Prince Harry will attend a private service at the late Princess Diana’s grave on what would have been her 56th birthday. In a brief statement, Kensington Palace said Wednesday, June 28, 2017, that the July 1 service will be conducted by the Archbishop of Canterbury and attended by Diana’s family. (AP Photo/Jerome Delay, File)

FILE - In this May 14, 2012 file photo, Prince Mohammed bin Salman waits for Gulf Arab leaders ahead of the opening of Gulf Cooperation Council summit, in Riyadh, Saudi Arabia.Saudi Arabia's King Salman has appointed his 31-year-old son Mohammed bin Salman as crown prince, removing the country's counterterrorism czar and a figure well-known to Washington from the royal line of succession. In a series of royal decrees issued Wednesday, June 21, 2017 and carried on the state-run Saudi Press Agency, the monarch stripped Prince Mohammed bin Nayef, who was first in line to the throne, from his title as crown prince and from his post as the country's powerful interior minister overseeing security. (AP Photo/Hassan Ammar, File)

FILE - In this May 14, 2012 file photo, Prince Mohammed bin Salman waits for Gulf Arab leaders ahead of the opening of Gulf Cooperation Council summit, in Riyadh, Saudi Arabia.Saudi Arabia's King Salman has appointed his 31-year-old son Mohammed bin Salman as crown prince, removing the country's counterterrorism czar and a figure well-known to Washington from the royal line of succession. In a series of royal decrees issued Wednesday, June 21, 2017 and carried on the state-run Saudi Press Agency, the monarch stripped Prince Mohammed bin Nayef, who was first in line to the throne, from his title as crown prince and from his post as the country's powerful interior minister overseeing security. (AP Photo/Hassan Ammar, File)

FILE - In this Saturday, June 17, 2017 file photo, Britain's Queen Elizabeth II and Prince Philip return to Buckingham Palace in a carriage, after attending the annual Trooping the Colour Ceremony in London. Buckingham Palace said on Wednesday June 21, 2017, Prince Philip is good spirits after being admitted to hospital. (AP Photo/Kirsty Wigglesworth, File)

FILE - In this May 14, 2012 file photo, Prince Mohammed bin Salman waits for Gulf Arab leaders ahead of the opening of Gulf Cooperation Council summit, in Riyadh, Saudi Arabia.Saudi Arabia's King Salman has appointed his 31-year-old son Mohammed bin Salman as crown prince, removing the country's counterterrorism czar and a figure well-known to Washington from the royal line of succession. In a series of royal decrees issued Wednesday, June 21, 2017 and carried on the state-run Saudi Press Agency, the monarch stripped Prince Mohammed bin Nayef, who was first in line to the throne, from his title as crown prince and from his post as the country's powerful interior minister overseeing security. (AP Photo/Hassan Ammar, File)