"My name is Kanye and I'm from the south side of Chicago," the 38-year-old rapper told the amused judges. "[I'm] originally a producer, I always wanted to rap and no one believed in me," he continued.
"Well good luck with all of that," Lopez joked before West began performing.
“I'm not really nervous because I do really believe in him," Kardashian said. "I didn't give any advice on singing, rapping...I just really believe in him.”
West, who is currently working on new music for his seventh studio album, "Swish," impressed the judges with an A cappella performance of his 2005 hit "Gold Digger," and left the audition with a "golden ticket" to advance to the next round.
American Idol begins its final season on Wednesday at 8 p.m. ET on Fox.