Twitter has been flooded with well-wishers congratulation the Duke and Duchess on their new bundle of joy!
Kensington Palace confirmed the exciting news that the Duchess of Cambridge had given birth to a healthy baby girl.
Celebrities have flocked to the social media site to express their excitement for the royal parents.
The Prince of Wales and the Duchess of Cornwall are "absolutely delighted" at the birth of the princess, a rep for Clarence House told Us Weekly.
The proud grandfather has previously spoken about his desire for a granddaughter!
Princess Diana’s brother, Earl Charles Spencer, took to Twitter to share his delight about his great-niece and to congratulate his nephew William.
"Very lovely news from the Lindo Wing — so happy for all 4 of them," he said.
We take a look at all the beautiful photos as Duchess Catherine and Prince William introduce their baby Princess to the word. Plus we have all the adorable snaps big brother, Prince George as he visits his little sister.
Click through to see all the Royal snaps and touching well-wishes celebrating the Duke and Duchess’ baby girl!