BBC News Willem-Alexander sworn in as ki
Willem-Alexander has been sworn in as king of the Netherlands following the abdication of Queen Beatrix.
He became the country's first king since 1890 when his 75-year-old mother signed the abdication deed earlier on Tuesday after 33 years on the throne.
Huge crowds of orange-clad partygoers are in Amsterdam to pay tribute.
Now known as Princess Beatrix, the former queen maintained a recent Dutch tradition of monarch's handing over power to a new generation.