At first glance, this is perhaps the most unlikely group of cocktail-party sudden best friends. Cabaret star Alan Cumming and … transsexual party favor Amanda Lepore? Conceptual fashion photog David LaChapelle and … leonine divorcée Jocelyne Wildenstein? Grungy I Shot Andy Warhol actor Jared Harris and … Hedwig star John Cameron Mitchell? But at last week’s Bowery Bar party for British fashion icon Isabella Blow, they all seemed to find much more than, say, ambisexual surrealism in common. “The other day, someone on the street mistook me for Hedwig,” said Lepore, shortly before doffing her clothes. “I took it as a compliment.”