The two-time Grammy winner, 35, hit the Dolby Theatre stage in Los Angeles with Hale, 9, and Okwuchi, 16, for the season 12 finale of the NBC reality competition on Wednesday.
In addition to performing her 2011 hit “Stronger,” Clarkson belted out the lyrics of her new song “Love So Soft.”
“You made it this far, and it’s all about getting on television and having people see you,” Clarkson told Hale and Okwuchi on the advice she would give the two contestants.
Clarkson knows a thing or two about performing on a reality singing competition.
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“I was crying, it was horrible,” Clarkson said about performing on the Dolby stage post-Idol.
America’s Got Talent airs Wednesdays (8 p.m. ET) on NBC.