The show, which was two hours long, was broadcast live from Los Angeles' Universal Amphitheatre.
Ruben closed the show by singing Flying Without Wings, while the crowd all chanted his name.
Clay called him "one of the most talented people I know."
American Idol 2 has been hugely popular. Kelly Clarkson, the winner from the first series, saw her album Thankful shoot to the top of the charts in April.
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