The Duke and Duchess of Cambridge have left hospital with their new baby daughter, who slept throughout
The new princess was born at 08:34 BST (07:34 GMT), on 2 May, 2015, two-and-a-half hours after the Duchess of Cambridge was admitted to hospital
Prince William told reporters he was "very happy" at the arrival of his second child
The duke brought Prince George to the hospital so that the young prince could meet his sister
The name of the baby, fourth in line to the throne, is yet to be announced
Chris from Aberdeen emails: "Congratulations to the couple on the birth of their daughter. I hope both mother and baby are doing well. My congratulations in equal measures also goes out to all the other new parents across the country and around the world."
Blonde-haired Prince George left the same hospital himself as a newborn just under two years ago. The 21-month-old was sporting a blue jumper with a white collared shirt underneath and blue shorts as he went in to see his sister today.
Image source, PATo see a video of the two princes arriving at St Mary's Hospital click here
The duke stood on the steps to the Lindo Wing with Prince George, where they both waved to crowds, before going inside for the young prince to meet his new sister.
Jennifer Peros, US Weekly magazine
Image source, @jenperos@jenperos tweets, external: These guys deserve some booze! They've been waiting here at #LindoWing for 13 days. Cheers! #UsRoyalBaby
Melanie Bromley, E! News and E! Online
@melaniebromley tweets, external: We're ready and waiting. Rumor is #katemiddleton #princewilliam and #princessofcambridge Could leave…
Rebecca English, royal correspondent for Daily Mail
@RE_DailyMail tweets:, external I think #PrinceGeorge is about to break the internet #RoyaBaby
The Duke of Cambridge has gone into the Lindo Wing with Prince George to visit his wife and new daughter. Prince George gave the crowds a wave as he went inside.
Prince William had arrived back at St Mary's Hospital with Prince George.
Paddington
@paddingtonbear tweets, external: The #royalbaby has chosen a very good place to be born. #Paddington certainly gave me the right start for my arrival in London.
Press Association Royal Reporters
@PARoyal tweets:, external The Queen is wearing pink today - for a girl? via @tommywilkinson #RoyalBaby
The Duke of Cambridge is reported to have said "I'm just going to pick up George" as he left the hospital.
The prince is now en route to Kensington Palace. He emerged from the hospital amid shouts from the crowd and the gathered media for a word, telling them he was "very happy", before driving away.
BBC royal correspondent Peter Hunt
tweets, external: Prince William leaving the Lindo Wing: very happy. Just off to pick up George. #RoyalBaby
Prince William has left the Lindo Wing at St Mary's Hospital, saying he is "very happy", before driving himself to Kensington Palace to visit Prince George.
The wait for Prince William to emerge from hospital goes on - every movement near the doors of the Lindo Wing prompts a flurry of activity among the assembled press pack. Two waiting Range Rovers are outside. We're expecting him to leave shortly.
Image source, EPAAlice, Charlotte, Victoria and Elizabeth are among the bookmakers' favourites for the new princess's name. However, there are plenty of other names to place a bet on. According to Coral, Catherine is 50/1, Anastasia is 200/1, while Kylie and Chardonnay both have odds of 1,000/1.
Image source, APThe Queen is on an official engagement in Richmond, North Yorkshire, where she is wearing a pink coat - prompting speculation her choice of outfit is her own tribute to her new great-granddaughter.
Lego
Lego has joined the many public bodies and companies celebrating the news on Facebook, posting this image, external with the caption: It's a girl! #RoyalBaby
Image source, LegoThe prince has been at the London hospital since about 06:00 BST, when his wife the Duchess of Cambridge was admitted during the early stages of labour.