I have a busy and wicked weekend and have a double shift on Monday, so I thought I'd say:

Wishing you a Happy Birthday and many more to come.
I hope all your birthday dreams and wishes come true.
Not just a year older, but a year better.
Here's to another year of experience.
A simple celebration, a gathering of friends; here is wishing you great happiness, a joy that never ends.
A birthday is just the first day of another 365-day journey around the sun. Enjoy the trip.

Happy Birthday Kay.