Here are just a few of the initial reactions to the wonderful and historic event from notable figures around the world...
I'm delighted for the Duke and Duchess now their son has been born. The whole country will celebrate. They'll make wonderful parents.
— David Cameron (@David_Cameron) July 22, 2013
Congratulations to The Duke and Duchess of Cambridge. Good news to make the whole country smile
— Nick Clegg (@nick_clegg) July 22, 2013
Many congratulations to the Duke and Duchess of Cambridge. I wish them and their son all happiness and good health.
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— Ed Miliband (@Ed_Miliband) July 22, 2013
Congratulations to the Duke and Duchess of Cambridge on their new arrival.
— Boris Johnson (@MayorofLondon) July 22, 2013
The official easel. We really are a marvellously bonkers country...
— Stephen Fry (@stephenfry) July 22, 2013
I may have been the first to announce the royal birth, but I definitely didn't break any news umbongo. Honest! All above board. #DaveBreak
— Dave Vitty (@davidvitty) July 22, 2013
Welcome to the future king! Congratulations William & Kate. Much Love, Queen Latifah #QLShow pic.twitter.com/b0d33ikWZv
— Queen Latifah (@IAMQUEENLATIFAH) July 22, 2013
— Louise Thompson (@LouiseAThompson) July 22, 2013
Awwww... It's a boy! Congratulations! Sooo happy for you! #GlassesRaised #Toast #Celebrations pic.twitter.com/GJaRvqnfEu
— Kath Jenkins (@KathJenkins) July 22, 2013
So pleased to hear that William and Kate had a baby boy. Long live the future king. MBB
— William Shatner (@WilliamShatner) July 22, 2013
Congratulations to Kate & William on the birth of their baby boy! So relieved that his name won't include the words Ivy or Apple.
— Joan Rivers (@Joan_Rivers) July 22, 2013
Woah people seem super excited for this new british band, the royal baby.
— Ellen Page (@EllenPage) July 22, 2013
Congratulations Will and Kate....
A boy,
'Prince........ Of Cambridge'Big love!
— Martin Kemp (@realmartinkemp) July 22, 2013
Awesome news about the royal baby! I am putting my bet on James as the name!
— Adam Pitts (@LawsonAdam) July 22, 2013
It's Official ! pic.twitter.com/YJfmjTVwCH
— Eamonn Holmes (@EamonnHolmes) July 22, 2013
Campaigning for the name Jason #PrinceJason nice ring to it @JasonMeetsWorld
— Luisa Zissman (@TheLuluLife) July 22, 2013
A lady had a baby.
— Joel McHale (@joelmchale) July 22, 2013
I think they should call it Rufus Hound. #royalbaby
— Rufus Hound (@RufusHound) July 22, 2013
Really hope the lil fella doesn't inherit the Charlie/Will hairline...
— Laura Whitmore (@thewhitmore) July 22, 2013
Look, I love Kate and Will and I think it's marvellous they have had a baby. BUT WHY IS EVERYONE BEING SO WEIRD?
— Dawn O'Porter (@hotpatooties) July 22, 2013
I've got a picture frame just like that one. Anyway, hurraaaahhh. Never a better excuse for a simply gigantic gin. Crack on. #RoyalBabyBoy
— Richard Hammond (@RichardHammond) July 22, 2013
Massive congratulations to Kate and William! Brings back so many amazing memories for me at the wonderful Lindo Wing 5 months ago! X
— James Thornton (@JamesThornton_) July 22, 2013
i hope the royal baby isclass="twitter-tweet">
Aaarrgghh it's a rebel, Harry's all alone out 'ere.
— Professor Green (@professorgreen) July 22, 2013
If William & Kate call there son prince Joffy Jofa I swear I will bogle naked.
— Harvey (@Harveyofficial) July 22, 2013
Ok, the babies here, now can ITV please put #LongLostFamily on.
— Adam Woodyatt (@AdamWoodyatt) July 22, 2013
Oh my gosh!!! It's a boy, A little Prince :) How amazing! :D #CONGRATULATIONS Perrie
— Little Mix (@LittleMixOffic) July 22, 2013
Go on Will.. Call it South East.. #kanyeLAD #RoyalBaby
— Danny Miller (@DannyBMiller) July 22, 2013
I think I'm probably not the only one who started crying today thinking about #Diana. Smiling from beyond!
— Perez Hilton (@PerezHilton) July 22, 2013
#GodBlessOurFutureKing very proud to be british right now!
— Kelly Osbourne (@KellyOsbourne) July 22, 2013
Congratulations to two of the loveliest people in the whole world on their baby boy. I am so happy for them.
— Ellie Goulding (@elliegoulding) July 22, 2013
It's a boy! How wonderful. Congratulations William & Kate. Glued to the TV.....hoping to see the proud father soon! x
— Ruth Langsford (@RuthieeL) July 22, 2013
Couldn't be happier for Kate and Wills... So many congratulations for our future King of England xxx
— Ollie Locke (@ollielocke) July 22, 2013
Opening the Bubbly to toast THEIR 'HRH'!
— OfficialAmandaHolden (@Amanda_Holden) July 22, 2013
historic moment blah blah blah but if you are sat outside the hospital of someone you don't know you need to start taking a look at yourself
— Ross Noble (@realrossnoble) July 22, 2013
> Prince William, Kate Middleton welcome royal baby son
> From Elizabeth to Zara: Royal babies over the years - pictures - pictures
> Royal baby playlist: Watch The Throne, 'Prince Charming' and more
> Royal baby: Kate Middleton pregnancy timeline
> The royal baby in numbers
> Kate Middleton's royal baby: What other famous babies has 2013 seen?
Royal babies through the years:
Royal babies over the years
