While not wishing to detract from the obvious person whose nominal birthday today is, it's also mine and my brother-in-law's. And we seem to be in fairly good company:-
http://www.corsinet.com/braincandy/xmastrivia2.html
It's quite exciting to have so many people around the world celebrating on my birthday!
Mum says that I made the Doctor leave church early, Christmas morning back in '55!
Cheers all - hope you are having a super special day!