The tweet – purported to be from Kensington Palace – claimed that the Duke and Duchess of Cambridge had welcomed a healthy baby girl named Charlotte who weighed 7lbs 5oz.
But it was swiftly debunked as a fake.
Kate is thought to be around three or four days overdue with her second child, and the 'great wait' is on for the birth of the new royal baby.
It's believed, however, that Kensington Palace will first announce when Kate is in labour ahead of the birth announcement as they did with Prince George in 2013.
Kate is scheduled to give birth once again at the Lindo Wing at St Mary's Hospital in Paddington, London. It's the same place where Prince George was born on 22 July 2013.
An official due date for the duchess was never confirmed by the palace, although she herself had said it was mid to late April.
It's not known yet whether the baby is a boy or a girl but whatever the sex, the baby will be fourth in line to the throne following a change to the rules of succession. It means if the baby is female, future brothers will not jump above her in the line of succession.
Yesterday, Kate and Wills sent hot drinks and pastries to royal fans who have been waiting outside the Lindo Wing for days.
A royal rep said: "The Duke and Duchess have seen the news reports about these people camping out and they just wanted to let them know they were thinking of them."
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