Prince William, Kate Middleton
Prince William and Kate Middleton leaving the King Edward VII hospital in central London in 2012, where she was treated for acute morning sickness early on in her pregnancy. The royal couple is expected to leave St. Mary's Hospital in London Tuesday and reveal their first-born son for the first time. Reuters

Celebrities took to Twitter in force Monday to congratulate Prince William and Kate Middleton on their newborn son. The royal baby hasn’t been named yet, but he has received a warm welcome in the U.S. as well as at home.

The Duchess of Cambridge gave birth on Monday afternoon to a healthy baby boy in the private Lindo Wing at St. Mary’s Hospital in Paddington, London. There’s no telling how long it will take for his parents to reveal his name, but in the meantime the royal baby is being welcomed into the world from all corners. Check out their tweets below:

There hasn’t been much information given out yet, except for the official announcement that was placed on an easel outside of Buckingham Palace. It read: “Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 4:24p.m. The baby weighs 8lbs 6oz. The Duke of Cambridge was present for the birth. The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, Prince Harry & families have been told and are delighted. Her Royal Highness and her child are both doing well and will remain in hospital overnight."

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