Variety said maintenance staff worked feverishly to fix the problem before the stars began arriving for the show at the Beverly Hilton Sunday afternoon.
The shower started when a sprinkler in the roof outside the hotel lobby went off after a TV crew bumped it with a light fixture, the entertainment industry trade newspaper said.
Journalists have since been allowed to assume their positions along the red carpet to cover the celebrity arrivals, the report said.
Boston schools pull out free condoms over wrapping complaints
Aaron Carter is still in love with Hilary Duff