"He's my big brother," the pop icon says of the reigning CMA Entertainer of the Year, "and I'm the closest to him of all the guys. Blake is just a rockstar; he's great. He's so playful, so fun and down to earth. He's got a lot of heart."
"Just a Fool" is featured on Christina's new album, Lotus.
Also on Monday's episode of "The Voice," Team Blake member Cassadee Pope sang the touching ballad, "Over You," co-written by Blake and wife Miranda Lambert. Watch a video on her tearjerking performance in the second video player below.
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