After months of near-rabid speculation in the tabloids, St. James' Palace has finally confirmed that Prince William and his wife Kate Middleton — more stiffly known as the Duke and Duchess of Cambridge — are expecting their first child. The news broke Monday after Kate was taken to a hospital in Central London with symptoms of acute morning sickness, which requires supplementary hydration and nutrients. According to the couple's official website, which was down at the time this article was posted, "the Duchess was admitted this afternoon to King Edward VII Hospital in Central London with Hyperemesis Gravidarum. As the pregnancy is in its very early stages, Her Royal Highness is expected to stay in hospital for several days and will require a period of rest thereafter." William is second in line to the throne after his father, Prince Charles, which also puts William and Kate's child in the direct line of succession. And due to a recent change in the rules of succession, the couple's child will likely be the heir to the British throne whether it's a boy or a girl.

Here, some initial reactions from Twitter: