Kate Middleton went into labor in the early hours of Saturday, May 2, and was said to be "doing well" ahead of the royal baby's birth Credit: Toby Melville - WPA Pool/Getty Images

Let the countdown to the royal baby begin! Nine days after her April 23 due date, pregnant Duchess of Cambridge Kate Middleton went into labor in the early hours of Saturday, May 2. Accompanied by her husband, Prince William, the second-time mom-to-be was driven from Kensington Palace to the Lindo Wing at St. Mary's Hospital in Paddington, where she gave birth to Prince George just under two years ago. 

A source tells Us Weekly that Middleton, 33, was "doing well" when she was admitted to the hospital at around 6 a.m. local time. Per a note on the Kensington Palace Twitter account, she was said to be "in the early stages" of labor.

Notably, the Duchess was admitted around a similar time in the morning when she went into labor back in 2013. She and Prince William welcomed their first son less than 12 hours later, just before 4:30 in the afternoon.

Time will tell how long the world has to wait to meet Royal Baby No. 2, but a palace spokesperson tells Us that the Duchess' labor is "progressing normally."

In a sign of the times, Kensington Palace tweeted the news of Middleton's hospital admittance shortly after 6:30 a.m., once she was safely checked in at St. Mary's and Queen Elizabeth and other members of the royal family had been alerted to the development. ("All members of the royal family were informed as soon as it was practically possible," a Kensington Palace spokesman tells Us.)

Almost immediately after, "#RoyalBaby" began trending online, and the first of many well-wishes poured in from people around the globe.

British Prime Minister David Cameron, for one, said in a statement, "My best wishes to the Duchess of Cambridge, who is having her second child today. The whole country will wish her well."

Indeed, Deputy British Prime Minister Nick Clegg followed with his own statement not long after. "Best of luck to the Duchess of Cambridge today, as she gives birth to her second child," he said. "The thoughts of the whole country will be with her." 

Meanwhile, back at Kensington Palace, George is being cared for by nanny Maria Borrallo and Middleton's parents, Carole and Michael Middleton.

Us Weekly is on the scene outside St. Mary’s Hospital in London — check out the exclusive royal baby livestream and check back often for ongoing updates on all things royal baby!