and country rocker jennifer nettles of sugarland, compete each week with their own hand-picked partnerunlocking the mystery of a great duet will unveil a single star. ♪ i'm begging you >> do something cute. >> reporter: kelly clarkson is one of them. she won the original "american idol" in 2002 and she knows a thing or two about pressure and critics. >> this wasn't your greatest performance for me. >> ten years later and i love, like, finding, you know, kids that were my age when i started. i had no guidance. ten years later, giving that to somebody was kind of a cool idea for me. >> reporter: jennifer nettles and her partners are dominating. landing at the top of the chart each week. >> y'all are both going to win and then we're going to do a new show and call it "trios." >> it's crazy amazing. i didn't know what it was going to be like, but the first note we sang, i'm like, oh, my god. i'm like, this may be some money here. >> reporter: but sharing the spotlight isn't always easy. >> i don't want to share the stage with anyone. i don't even like having dancers around. i want all eyes