Justin Bieber, Taylor Swift big winners at Billboard Awards

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Justin Bieber performs during the Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas(Reuters) – Pop stars Justin Bieber and Taylor Swift won the big prizes on Sunday at the Billboard Music Awards, which also honored legendary performers Madonna and Prince. Bieber, who was named top male artist, also performed at the show at the MGM Grand Garden Arena in Las Vegas. He also took home Billboard's first Milestone Award, chosen by fans, for musical innovation and ingenuity. "I'm 19 years old. I think I'm doing a pretty good job, Bieber said. "It should really be about the music. This is not a gimmick. I'm an artist and I should be taken seriously. …