Sascha Baron Cohen and Isla Fischer

Celebrities Party the Devil Out of Halloween; Photo Extravaganza! 2

Celebrities Party the Devil Out of Halloween; Photo Extravaganza!

Halloween has always been a great time to see and be seen for all manner of Hollywood celebrities. So TheImproper dropped into a number of parties to check out the fabulous costumes of stars from the East Coast to the West Coast over the past week of festivities.Brody Jenner, David Arquette, Derek Hough, Hillary Duff, Jeremy Piven, John Stamos, Kate Upton, Michelle Trachtenberg, Ryan Seacrest, Sascha Baron Cohen and Isla Fischer, Sean Penn, Stephanie Pratt, Tim Allen and Wayne Gretzky were among the celebrities spotted partying. ...