The celebrity business has expanded in proportion with the public interest and media coverage it garners. Entertainment PR firms, in their attempts to stay ahead of the curve, have introduced new practices to deal with the communications issues their clients face from traditional media, the blogosphere, and citizen journalists.

“We really look at ourselves as image architects or brand managers for the talent,” says Nate Schreiber, president of PMK/HBH, which works with actors like Johnny Depp. “And if you start looking at it ...