Kate is now believed to be around four days overdue and the royal couple's second baby is expected any time at the Lindo Wing of St Mary's Hospital in central London.
The Duchess of Cambridge, who remains at her Kensington Palace residence waiting to give birth, asked her staff to deliver croissants and Danish pastries to the band of royalist "superfans" who have been camped outside for nearly a month.
"The Duke and Duchess were aware that they had been out there for a long time and just wanted to do something for them," a Kensington Palace source was quoted as saying by The Daily Telegraph.
There was some speculation that Kate may have gone into labour today as security guards were spotted sweeping the hospital area with sniffer dogs. However, it appeared to be a "dry run" similar to one held before Prince George was born in July 2013.
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Meanwhile, bookies have now made tomorrow, April 29, William and Kate's fourth wedding anniversary, the 7/2 favourite for the day of the baby's birth.
International media organisations are on high alert sending their anchors to the hospital every now and then.
Parking restrictions have been in place since April 13 and media pens have also been up for almost two weeks.