During the agonising two week wait Mr Loughrey and his fellow fans were provided with showers and porridge from the hospital, and also used their new spare time to run errands for patients.
Moments later, the news will be announced via Royal Twitter and Instagram accounts before a traditional paper announcement is placed on an easel outside Buckingham Palace.
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She made her first public appearance almost five weeks later, attending a mental health reception at Buckingham Palace with the Duke of Cambridge and Prince Harry.
M other and baby are "doing well", while the Queen, Prince Philip and other senior members of the Royal family are said to be "delighted" with the news.
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A few days after the announcement that she was expecting her third child, Kate missed Prince George's first day at school as she was too poorly to attend.
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Kate had a straightforward, natural birth with George and Charlotte with no complications.
After being camped out for 15 days Mr Loughrey said he's heading for fish and chips for dinner, with champagne to raise a toast to the new Prince.
By Joe Brophy.
I f the Duchess of Cambridge gives birth by the end of the day as expected, the Royal baby will be born on St George's Day.
The timing of the announcement, falling on St George's Day, added to the occasion for waiting royalists outside.
This trusted member of Team Kate was said have been on standby for a month ahead of George's arrival.
ITV Picture Desk.