On April 27, King Willem-Alexander and Queen Maxima, along with their three daughters Crown Princess Amalia, Princess Alexia and Princess Ariane attended the final rehearsal of the 2nd The Streamers concert, as part of King's Day held at the palace Noordeinde in The Hague. The royal family get a backstage tour and talked with the technical staff. The date of King's Day marks the birth of King Willem-Alexander, which is April 27.