You'll want to join the free UD Beauty Junkies club in order to get your Urban Decay birthday freebie of free Afterglow.
Signup Freebie: Nothing? Please let me know in the comments if you get something!
Birthday Freebie: Free full-size Afterglow 8-Hour Powder Highlighter in Sin with your next purchase.
As per the instructions in the email, you need to “log in to your UD Beauty Junkies account and shop like normal (you must purchase any regularly priced item to redeem this reward). During checkout, click on the box to redeem “Your Birthday Fix” in the “UD BEAUTY JUNKIES” section, then select the Afterglow shade you want in the pop-up window.
And finally, if you're looking for more birthday freebies, then you've come to the right place!