America's Got Talent is wrapping up its 20th season with a two-night finale, starting Tuesday on NBC.
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Wednesday will be a results show in which one act will be presented with a $1 million grand prize.
Guest performers will include Ciara, Leona Lewis, Aloe Blacc and Manuel Turizo.
Terry Crews is the show's host, while Mel B, Simon Cowell, Howie Mandell and Sofia Vergara serve as judges.
