Yesterday evening, King Willem-Alexander, Queen Maxima, Princess Catharina-Amalia, Princess Alexia, Princess Ariane and Princess Beatrix of The Netherlands attended the concert "Queen Maxima a life full of music" at Royal Theater Carré in The Hague, organized by AVROTROS on the occasion of Queen Maxima's upcoming 50th birthday on May 17. The concert will be broadcast as a TV special on May 17. Queen Máxima of the Netherlands will celebrate her 50th birthday on May 17.