What I did for my 13th b-day party was we had a Paparazzi party!!! We sent out invitations to my 7 attending friends saying that it was a costume party, and in order to attend their parents had to RSVP NOT THEM!!! When teir parents called to RSVP, we explained to them that we were going to surprise the girls by blindfolding them and piling them in the car, and hauling them off to the local shopping mall. As soon as we got the OK from their parents, we started preparing for how many guests would arrive. As soon as they got here (in costumes) we blind folded them and, yup, you guessed it, took them to the mall. There we removed the blind folds and explained the rules; You and your team (of 4) would walk around the mall with a list of celebrities and a ploroid sticker camera. You would look at the celebs. on the list and find people that look like them. There you would have to ask for that persons picture. Once you finished you would try to beat the opposing  team back to the base. Who ever won got a 10$ gift certificate to Tagret. Then everyone went home! I had the best time!