Amsterdam mayor Eberhard van der Laan (R) stands next to Dutch King Willem-Alexander, Queen Maxima and Crown Princess Catharina-Amalia (3rd L) Princess Alexia and Princess Ariane (L) as they wave to the crowd during a boat parade in Amsterdam April 30, 2013. The Netherlands is celebrating Queen's Day on Tuesday, which also marks the abdication of Queen Beatrix and the investiture of her eldest son Willem-Alexander.[Photo/Agencies]