Chart-toppers like the Black Eyed Peas turned out in full force to perform with show contestants in the star-studded two-hour finale, which saw underdog Allen, 23, beat off fierce competition from judges' favorite Adam Lambert, 27, after a record 100 million votes were cast.
Second runner-up Danny Gokey also sang a duet with Lionel Richie, while Queen Latifah belted out “Cue the Rain” with former Idol hopeful Lil Rounds, and Steve Martin pulled out his banjo to perform “Pretty Flowers” with another two contestants.
Lambert fulfilled a childhood dream as he took the stage with Kiss, singing the band's “Detroit Rock City” and “Rock and Roll All Nite,” while Allen sat with Keith Urban to sing “Kiss a Girl.”
Before the winner was announced, Lambert and Allen were accompanied by rockers Queen and a choir for a rousing rendition of “We Are the Champions.”
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