'American Idol' showcase pairs Fantasia Barrino with La'Porsha Renae for 'Summertime'

(Zap2it) -- Fantasia Barrino was on hand for the first group of "American Idol" Season 15 semi-finalist duets Thursday night. Putting her with La'Porsha Renae was a no-brainer, but pairing them to re-create Barrino's iconic "Summertime" performance from Season 3 was inspired.

The two powerhouse divas took the stage by storm, providing one of the best performances of the night. It even brought judges Keith Urban and Jennifer Lopez to their feet.

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"Watching Fantasia sing with somebody like La'Porsha, it's mind-blowing. Honestly, it's mind-blowing. You did a fantastic job," said J-Lo.

"It was the first one I've seen that's so beautifully matched. It's like an unstoppable force meets an immovable object. Fantastic," Urban echoed.

Harry Connick Jr. perhaps summed it up the best with his comments. "What that turned into was kind of what I was hoping it would turn into -- a battle of runs. And both of y'all killed it."