Congratulations, tweet celebs on birth of royal baby

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: I'm delighted for the Duke and Duchess now their son has been born. The whole country will celebrate. They'll make wonderful parents.

Rihanna: Kate Middleton's Baby, Congratulations :)
Cheryl Cole: Congratulations to William and Kate!! So happy they have a healthy baby and everyone is good. Can't wait to see him now.

And that little boy has no idea what his existence already means to so many people
Ellen DeGeneres: It's a boy! So happy for my cousin Kate and the future King of England!

Steve Martin: I would be so honored if they named the royal baby, "Steve Martin."
Stephen Fry: The official easel. We really are a marvellously bonkers country.
Emma Bunton: It's a boy!!! Special times ahead for Kate and William. Xxxx