St Mary's Hospital, Kate Middleton

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Prince William will be right by Kate Middleton's side when she delivers the royal baby, but the duchess has a lot of support outside St. Mary's Hospital, too.

Crowds are gathered in record numbers outside the Lindo Wing, eagerly awaiting the sight of a royal press officer coming through those doors, confirming the arrival of a little prince or princess. And despite the fact that Monday is forecast to be London's hottest day of the year, hundreds (if not thousands) of fans are sweating it out!

Kate and William arrived at a back entrance of the hospital shortly before 6 a.m. local time Monday. Later, as the crowds excitedly began to grow larger in number, extra police security arrived outside the hospital to ensure everyone's safety. One eyewitness estimates there are at least four times as many well-wishers gathered in anticipation than there were when Princess Diana was in labor with Will or Prince Harry

Duchess Catherine, Kate Middleton, Prince William

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It's expected to remain at least 80 degrees outside, but fortunately, St. Mary's is air-conditioned. This means Kate—and all the other mums in labor—will remain cool and comfortable. A source tells E! News things inside the hospital are "business as usual," joking that other patients in the Lindo Wing probably "have other things on their mind aside from Kate."

If the baby isn't born until Tuesday, then grandmum-to-be Carole Middleton will be right: Kate's mom reportedly predicted the royal baby would be a Leo, which means he or she would be born between July 23 and August 22. Other  family members' were hoping that the child would be delivered by the end of last week, and the betting Brits had plenty of their own predictions.

Really, though, it's up to the newest royal when the time is right to make his or her royal debut!

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