As Clooney, Cruz, and Knowles talk shop, DiCaprio contemplates ozone depletion.

Leonardo DiCaprio's new enviro-doc The Eleventh Hour premiered the other night at the Arclight in Hollywood. And you gotta hand it to the kid��������wait, isn��������t he like 40 now?��������he puts his money where his mouth is. Not only did he produce the two-hour film that features hardcore scientists going on��������and on, and on��������about how poorly we've abused Mama Earth, but he shows up in it, too.

Not as centered as An Inconvenient Truth, it still makes some pretty good points. At the after-party, the demographic got considerably older, with all these gray-haired test-tube types craning their necks to sneak peeks at Adrian Grenier, Kate Bosworth (who saved fabric by wearing a skintight dress��������hey, she's an environmentalist!), Tobey Maguire, and Leo himself, in a chic Armani suit. "He might wear Armani in public," said one retail insider, "but he's always shopping at Prada." Something about their recycling policies, maybe. ��������Merle Ginsberg Image courtesy of Patrick McMullan Company