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Tue, 20 Nov 2012 07:17:44 GMT | By Sean Plummer
The 2012 American Music Awards: Best and worst moments

Best performance so far

Usher (© Kevin Winter, Getty Images)
  • Nicki Minaj, Christina Aguilera (© Kevork Djansezian, Getty Images)
  • Usher (© Kevin Winter, Getty Images)
  • Taylor Swift (© Lester Cohen, WireImage/Getty Images)
  • Carly Rae Jepsen (© Danny Moloshok, Reuters)
  • The Wanted (© Danny Moloshok, Reuters)
  • Kelly Clarkson (© Christopher Polk, Getty Images)
  • Ke$ha (© Kevin Winter, Getty Images)
  • No Doubt (© Alexandra Wyman, FilmMagic/Getty Images)
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Justin Bieber's mentor Usher (and three-time nominee tonight) Usher gets the three-hour party started with a medley of 'Numb,' 'Climax' and 'Can't Stop, Won't Stop,' showcasing surprisingly unimpressive dance moves in a pop world run by the likes of Chris Brown.