It's been a tradition of mine for some time now to wear a tiara on my birthday. For the past few years, I've had to tone it down slightly to avoid strange looks at school or work!
So, it may not be a tiara exactly, but it's my version of one!
http://i143.photobucket.com/al.....030098.jpg
and a close-up:
http://i143.photobucket.com/al.....030118.jpg
It's more of a poof-ball than a tiara, but it still felt princess-y