Kate's pregnant! The world reacts to the #royalbaby on Twitter

After months of speculation (and a lot of reading into Kate's clothing choices), it’s finally official: Duchess Kate and Prince William are expecting an heir to the throne. It was the baby announcement heard 'round the world, and the Twittersphere instantly lit up with reactions to the couple's big news.We’ve rounded up a selection of tweets, but be sure to check back for more updates as the