This time Ashlee Simpson sang it for real. We think. The 19-year-old pop artist was among a slew of stars who played Monday night during the 2004 Radio Music Awards in Las Vegas. Simpson was in the spotlight after a weekend glitch on "Saturday Night Live" that revealed she had been lip-synching one of her songs. Before she sang "Autobiography" off her hit album Monday, awards show host Carson Daly reassured the audience they were getting a live performance. Simpson later said acid reflux disease made her lose her voice four hours before the "SNL" appearance. As for the awards themselves, Usher won Hip-Hop Artist of the Year and Hip-Hop Song of the Year. Linkin Park grabbed the Alternative Rock Song of the Year and Rock Artist of the Year.