Leaders, celebrities react to royal birth

POSTED: 2:37 PM PDT July 22, 2013    UPDATED: 11:53 AM PDT July 23, 2013 
William and Kate introduce royal baby 4

As news that Catherine, Duchess of Cambridge, had given birth to a boy, reactions quickly followed from the baby's family and political leaders around the world. And of course, plenty of celebrities weighed in on Twitter.