The clock strikes 12
And there's an unexpected, jaunty rhythm
It's the day you were born, my love
Surprise; say cheese!
Check one two
I'll wrap a congratulatory ribbon around you
And give you this song today
HAPPY BIRTHDAY! (Yeah!)
HAPPY BIRTHDAY! (Oh! Yeah!)
HAPPY BIRTHDAY! (Yeah!)
Happy birthday to you!
SCANDAL - "Happy Birthday"

Well, the song says it all xP
Your birthday + Kingdom Hearts I think makes you happy, he, he.
Happy Birthday and hope you have a really great day my dear friend.