Google knows it is my Birthday?

I was browsing the web while watching the Superbowl this evening (Fergie and Slash...are you kidding me!) and noticed that Google had a custom banner image for me as shown below.

I thought that was pretty spiffy and then remembered that if you click on these special images, you normally get the background or history behind the image. See what I discovered when I clicked the image after the click below.