Now this is a sister duo who only like to have fun!  Paris Hilton and younger sis Nicky Hilton looked like a bunch of giggly school girls as they made their way to and from the Pop Factory on Friday where Todd Goldman’s “Stupid Art Show” was on display.

The girls chatted on their cell phones (they both conveniently received phone calls just as they went outside in front of the paparazzi (I wonder who they are talking to all the time) but kept the feeling casual as they made their way to the waiting SUV.