I love when celebrities demonstrate a sense of humor. Roberto Cavalli's Halloween bash was packed with the most attractive women dressed in their wittiest gowns, but the true star of the night was cavalli himself dressed as his designer collegue - Karl Lagerfeld. I'm not sure about the nature of relationships between the two - are they friends, enemies or maybe frenemies? But this costume definitely makes me smile. Now I start imagining Marc Jacobs dressing as John Galliano and DVF as Vera Wang. That would be a fun Halloween!