Kate Middleton is expected to be in labor for up to 12 hours. She wants to give birth naturally.

Kate Middleton is expected to be in labor for up to 12 hours. She wants to give birth naturally.

Kate Middleton, the Duchess of Cambridge and mother-to-be of a royal heir, went into labor around 5:30 am today and is currently resting comfortably in St Mary’s Hospital in Paddington, west London, in the early stages of birth, according to the palace.

Crowds are gather outside the hospital, (click her for live stream) and outside Buckingham Palace, where the birth will be announced simultaneously.

The weather in Britain is bright sunshine on what is expected to be the hottest day of the year for that country. But that hasn’t stopped throngs of people from waiting anxiously outside both locations for news of the birth.

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“The Duchess of Cambridge has been admitted this morning to St. Mary’s Hospital, Paddington, London in the early stages of labor,” a the palace said.

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“The Duchess traveled by car from Kensington Palace to the Lindo Wing with The Duke of Cambridge.”

Prince William was born in the same hospital. The Duchess is expect to be in labor for around half a day. The average for a first-time mother is about 12 hours, which would put the birth late in the afternoon or early evening London time, which is five hours ahead of New York City.

The baby, sex unknown as of yet, will be third in line for the throne, behind Prince Charles, the father of Prince William, who is second in line. William’s brother Prince Harry is fourth and the Prince Andrew, the Duke of York, is fifth, according to the palace.

Queen Elizabeth is currently at Windsor Castle and is at Buckingham Palace late in the afternoon. Prince Charles is on a two day visit to Yorkshire, according to London’s Daily Mail.

The baby’s royal life will begin at birth. He or she will become the Prince or Princess of Cambridge and be addressed as His, or Her, Royal Highness. Under a recent change in the law, the baby will become Queen if it is born female.

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He, or she, will also be commander-in-chief of the armed forces, the Church of England’s supreme governor (thanks to Henry VIII) and head of the Commonwealth, a loose confederation of 54 nations that were once royal colonies. The United States, which fought and won a war for independence, is not among them.

Check out TheImproper’s live stream from St Mary’s Hospital by clicking here and follow TheImproper on Twitter for the latest updates on the royal birth.