Combo picture shows Britain's Prince Charles kissing Diana, Princess of Wales during their wedding in London on July 29, 1981 and (on right) Britain's Prince William kissing his wife Kate, Duchess of Cambridge on the balcony of Buckingham Palace on April 29, 2011, in London. AFP PHOTO

PRINCE AND PRINCESS OF WALES PHOTO:CLB/LFI

PRINCE & PRINCESS OF WALES PHOTO:CLB/LFI

PRINCE & PRINCESS OF WALES PHOTO:CLB/LFI

The Prince and Princess of Wales, Prince Charles and Princess Diana leave St. Mary's Hospital in Paddington, London with their new baby son on Sept. 16, 1984. Princess Diana carries new baby, Prince Harry who was born on Sept. 15. (AP Photo)

The Prince and Princess of Wales, Prince Charles and Princess Diana leave St. Mary's Hospital in Paddington, London with their new baby son on Sept. 16, 1984. Princess Diana carries new baby, Prince Harry who was born on Sept. 15. (AP Photo)

The Prince and Princess of Wales, Prince Charles and Princess Diana leave St. Mary's Hospital in Paddington, London with their new baby son on Sept. 16, 1984. Princess Diana carries new baby, Prince Harry who was born on Sept. 15. (AP Photo)

The Prince and Princess of Wales, Prince Charles and Princess Diana leave St. Mary's Hospital in Paddington, London with their new baby son on Sept. 16, 1984. Princess Diana carries new baby, Prince Harry who was born on Sept. 15. (AP Photo)

The Prince and Princess of Wales, Prince Charles and Princess Diana leave St. Mary's Hospital in Paddington, London with their new baby son on Sept. 16, 1984. Princess Diana carries new baby, Prince Harry who was born on Sept. 15. (AP Photo)

Britain's Prince Charles and Princess Diana as they board a Boeing 707 of the Royal Australian Air Force at London's Heathrow Airport on March 18, 1983, prior to leaving on a six-week tour of Australia and New Zealand. The couple will be accompanied by their eight-month-old son Prince William, who boarded the aircraft about an hour ahead of his parents. (AP Photo/Peter Kemp)

(FILES) In a file picture taken on September 5,1982 Britain's Queen Elizabeth II (L) is accompanied by her son Prince Charles, Prince of Wales R) and Diana, Princess of Wales, during the Braemar games. Britain's Queen Elizabeth II will start five months of diamond jubilee celebrations this weekend marking 60 years to the day on February 6, 2012 since she ascended to the throne after the death of her father. AFP PHOTO / POOL

Britain's Prince Charles, Prince of Wales, with his wife Princess Diana, holds his newborn son Prince William as they leave St. Mary's Hospital, Paddington, London, June 22, 1982. (AP Photo/Staff/Redman)

Britain's Prince Charles, Prince of Wales, with his wife Princess Diana,taking their newborn son Prince William, as they left St. Mary's Hospital, Paddington, London, June 22, 1982. (AP Photo/Staff/Redman)

FILE - In this June 22, 1982 file photo Britain's Prince Charles, Prince of Wales, with his wife Princess Diana taking their newborn son Prince William, as they left St. Mary's Hospital, Paddington, London. William, the Duke and and Kate, Duchess of Cambridge are very pleased to announce that the Duchess of Cambridge is expecting a baby, St James's Palace officially announced Monday Dec. 3, 2012. (AP Photo/John Redman, File)

(FILES) A file picture take on July 29, 1981, shows Britain's Prince Charles (L) and Lady Diana, Princess of Wales, on their wedding day at St Paul's Cathedral in London. Prince Charles said Tuesday November 16, 2010, he was "thrilled" at the engagement of his eldest son Prince William to his long-term girlfriend Kate Middleton, adding: "They have been practising long enough." AFP PHOTO/STR/FILES