During the last day of the battle rounds on The Voice Tuesday, Kelly Clarkson was faced with a very tough decision – keep her pop-gospel teen duo, the Cunningham sisters, or 30-year-old Parker McKay, the contestant with a heartbreaking backstory. While both the Cunningham sisters and Parker slayed their haunting rendition of Lesley Gore's "It's My Party," Blake Shelton knew exactly what Kelly should do. "I thought you sounded incredible," Blake told Parker. "But you were up against The Cunningham Sisters." Blake then turned to Kelly and said, "Do you want my advice? Quit." Blake telling Kelly to quit was obviously a joke. In fact, earlier in the show, Ariana Grande also joked about quitting when she herself had a hard decision. Fortunately, neither coach quit and, in the end, Kelly shared, "Man. I'm so bummed right now," said Kelly. "I just can't fight the, like, what is gonna happen, in my heart, so I have to pick," before declaring the teenage Cunningham sisters as the winners to move on to the Knockout rounds. " I think the thing that really steals me about The Cunningham Sisters is just to have that kind of confidence and precision at such a young age. Like, imagine this whole journey. I think anything I kind of throw at them, like, a challenge, they like it and they kind of grow in that arena, so I'm very excited about it," said Kelly.