Netherlands' Crown Prince Willem Alexander and Princess Maxima are seen arriving at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton in central London on this April 29, 2011 file photo.(Xinhua/Reuters)

A TV grab shows Dutch Queen Beatrix giving a televised speech on Jan. 28, 2013. Dutch Queen Beatrix announced her abdication in favor of her eldest son Prince Willem-Alexander in an address to the nation on Monday evening. (Xinhua/Pan Zhi)

Dutch Crown Prince Willem-Alexander is seen giving the thumbs-up to a pastry shop as he and Crown Princess Maxima (rear) walk through "New Amsterdam Village," in New York on this September 13, 2009 file photo.(Xinhua/Reuters)

In this file photo Dutch Queen Beatrix, right, and Dutch Crown Prince Willem-Alexander, left, wave to wellwishers from the balcony of Royal Palace Noordeinde after the Queen officially opened the new parliamentary year in The Hague, Netherlands.(Xinhua/Reuters)

Netherlands' Queen Beatrix is seen smiling during a welcome ceremony at 'Zeche Zollverein', former coal mine in Essen in this April 15, 2011 file photo.(Xinhua/Reuters)

Netherlands' Queen Beatrix is seen arriving for a meeting with Singapore's President Tony Tan at the Istana in Singapore on this January 24, 2013 file photo.(Xinhua/Reuters)

Prince Willem-Alexander (R) of the Netherlands and his wife Princess Maxima are seen during the annual summer photocall in Wassenaar on this July 7, 2012 file photo. (Xinhua/Reuters)