Summer's first box-office behemoth, Iron Man, drew an A-list-heavy crowd—including Harvey Weinstein, Diana Ross, and Michael Stipe—to the basement of the Tribeca Grand on Monday night. At the after-party, guests toasted the film's co-stars, Robert Downey, Jr., and Gwyneth Paltrow, before settling into that age-old debate: "Which superhero would you be?" Event co-host Michael Kors expounded on the undeniable "rowr" appeal of Catwoman, while cast member Terrence Howard chose X-Men's Professor Xavier: "Intelligence—that's power." Director Jon Favreau insisted he wasn't picky, so long as he could wear Lycra that actually breathed. Leelee Sobieski admitted that spandex was already a part of her wardrobe, but she refused to divulge in what way or just how often. "I can't tell you about that," she politely demurred. We understand, Leelee—your Spanx secret is safe with us.

—Darrell Hartman