Nature Calls

The biggest stir at the March 12 premiere of Forces of Nature at L.A.'s Mann's Village Theatre wasn't created by the artificial-rain machine or any of the celebs in attendance (including Judd Nelson, Dan Aykroyd, Rita Wilson, Jeffrey Katzenberg, and Nature costars such as David Strickland and Maura Tierney). It was caused by star Ben Affleck's on-screen striptease. ''Oh, we enjoyed that dance from the first day we started shooting,'' said costar Sandra Bullock. ''That was one of the luxuries of this movie.'' But not everyone was impressed. ''I told Ben, 'You've let your pecs fall,''' said Michael Bay, who directed the actor in Armageddon. ''When we work together again, I'm going to get his sh-- back together.'' Affleck took it in stride. ''Doing something not purely vanity driven is complete anathema to Michael,'' he laughed. ''I can still live with myself.''