And we're not the only ones who are getting ever so slightly giddy about the thought of a new royal arrival - the celeb world is too.
Find out which famous types were the first to congratulate the Royal couple on Twitter...
Kate Middleton pregnant: Celebs react
Also on HuffPost:
More:Kate Middleton Pregnant Royal Baby Prince William Kate Middleton Baby Prince William And Kate Middleton
SUBSCRIBE TO & FOLLOW UK DAILY BRIEF