Paris Hilton Nicky Hilton print dress fred segal

On Wednesday Paris and Nicky Hilton shopped at Fred Segal and Diane Von Furstenberg, and the fun didn't stop there! After a solid day of retail therapy, P tweeted, "Fun night hanging out at @KathyHilton's house with @NickyHilton eating chocolate chip cookies & watching Sex in The City. #SisterNight." Awww!

Of course, the blonde heiress also took some time to get ready for her upcoming Halloween bash, picking up a Frankenstein doll, strobe lights, fake swords and various other goodies.

The other day Paris tweeted a pic of several sexy Disney princess-inspired costumes, and the other day she wrote, "Can't wait to see the custom made Halloween costumes that @ElectricLaundr is making me! I love everything they design. #RaverCouture." However, she also went shopping at Trashy Lingerie the day before that, so it looks like she has a wealth of costumes to choose from...