Crown Prince Billah greets Raja (King) Sirajuddin of the Malaysian state of Perlis at the installation of the new King and Queen of Malaysia in April, 2012.
B. The Netherlands
King Willem-Alexander and Queen Maxima taking a bow for a military standard during the Prinsjesdag. The Hague, September 17, 2013
Princess Charlene and Prince Albert greeting Emperor Akihito and Empress Michiko upon their arrival for a luncheon at the Imperial Palace in Tokyo, Japan, on November 1, 2010.
June 20, 2012 - Princess Haya curtsies to Queen Elizabeth on the second day of Royal Ascot, 2012.
Prince Bertil and Princess Lilian bowing and curtsying towards King Carl Gustaf and Queen Silvia during their wedding ceremony on December 7, 1976 at Drottningholm Palace, Sweden.
April 27, 2007 - The new Queen of Malaysia, Nur Zahirah, greets her Bruneian counterpart, Queen Saleha at a royal banquet to mark the installation of the former's husband Sultan Mizah Zainal Abidin (pictured in the background) as the 13th King of Malaysi.
G. Great Britain
The then-Princess Elizabeth curtsying to King Haakon of Norway during his state visit to London on June 5, 1951. Her sister, Princess Margaret, and mother, Queen Elizabeth, look on.
Rome, 3 October 2004, Queen Fabiola bows for Pope John Paul II and kisses his hand. The two met at St Peter's square during the beatification ceremony for the Blessed Emperor Charles I of Austria.
Source: Le Soir
Prince Felipe of Spain and Princess Letizia receive King Willem Alexander and Queen Maxima of The Netherlands.
Crown Prince Haakon and Crown Princess Mette-Marit of Norway curtseying to the King and Queen of Thailand during celebrations for the King's Diamond Jubilee, 2006.