LOS ANGELES -- Rags-to-riches drama "Slumdog Millionaire" continued its sweep through the Hollywood movie industry awards, on Saturday winning top honors for an adapted screenplay.

The Writers Guild of America honored the film, along with the biographical drama "Milk," at its annual award ceremony for film writing.

The honor further cements the Oscar frontrunner status for "Slumdog," which is based on the novel "Q&A" by Vikas Swarup. The film has collected 10 Oscar nominations.

Other films nominated for the screen writer?s award were "Doubt," "Milk, " "Frost/Nixon," and "The Curious Case of Benjamin Button."

"Slumdog Millionaire" also on Saturday won top honors from the Producers Guild of America Awards.

The film is considered a leading contender to collect an armful of gold statuettes at the February 22 awards ceremony, including possible best picture honors.