Catherine, Duchess of Cambridge gave birth to her and Prince William's first child, a boy, and everyone -- from her father-in-law Price Charles to others -- expressed happiness at the birth of the child, who will be third in line to the British throne.
Ever since the child came into the world Monday 4.24 p.m., best wishes from royals to politicians to actors have been pouring in.
According to a spokesperson of the royals, the 31-year-old new mother and baby are doing fine. The baby, born in the Lindo Wing at St. Mary's Hospital in Paddington here, weighed 3.8 kg.
His father, Prince William, was born here in 1982, as well as his uncle Prince Harry.
Prince William, 31, released a statement saying that he and his wife, whom he married at Westminster Abbey in April 2011, could not be happier following the birth of their son.
Prince Charles and his wife Duchess Camilla are also excited to welcome their grandchild.
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"Both my wife and I are overjoyed at the arrival of my first grandchild. It is an incredibly special moment for William and Catherine and we are so thrilled for them on the birth of their baby boy," he said in a statement.
British Prime Minister David Cameron and US President Barack Obama, among others, congratulated the new parents.
"It is wonderful news from St. Mary's, Paddington, and I am sure that right across the country, and indeed right across the Commonwealth, people will be celebrating and wishing the royal couple well," David Cameron said.
"It is an important moment in the life of our nation but, I suppose, above all it is a wonderful moment for a warm and loving couple who have got a brand new baby boy," he added.
Obama also released a statement on his and wife Michelle Obama's behalf.
"Michelle and I are so pleased to congratulate The Duke and Duchess of Cambridge on the joyous occasion of the birth of their first child. We wish them all the happiness and blessings parenthood brings," he said.
When the Duchess of Cambridge, maiden name Kate Middleton, went into labour, many celebrities took to Twitter to express their excitement.
TV personality Kelly Osbourne: It's all so exciting. The Royal Baby is on the way!
Singer Melanie Brown: Whoop whoop the royal baby is coming.