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Ann Oldenburg, USA TODAY

Can you hear the palace trumpets blowing?

Happy royal news!

Clarence House says Kate Middleton, Duchess of Cambridge, 30, and her hubby Prince William, 30, are expecting a baby.

Their royal highnesses and families are "delighted" with the news.

And also announced: The Duchess was admitted this afternoon to King Edward VII Hospital in Central London with "Hyperemesis Gravidarum," says the statement, explaining that it is "very acute morning sickness, which requires supplementary hydration and nutrients."

The palace also says, "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."

Speculation of a royal baby on board has been floating around since Kate was spotting drinking water, not wine, at a state banquet in Singapore in September.

But even as recently as last week, she was keeping up royal appearances, even playing field hockey with schoolchildren at her former school.

The news of her pregnancy sent Twitter into overdrive. Prime Minister David Cameron wrote that he was "delighted by the news" and said the couple will make "wonderful parents."

"Mazel! Mazel!!" tweeted Katie Couric.

Added Piers Morgan, "Congratulations to every magazine editor for calling Kate Middleton's pregnancy - especially those who did covers on it 11 months ago."

Wrote Khloe Kardashian Odom: "Congratulations to the Duke and Duchess of Cambridge!! A royal baby!!! :) awwww so sweet"

The baby, as first-born to William who is second in line for the throne after his dad Prince Charles, could become monarch one day, notes AP. Whether a boy or a girl, the child will be next in line behind William in the line of succession to the throne.

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