"American Idol" contestant Crystal Bowersox, who was hospitalized for an unknown illness on Tuesday, recovered for last night's performance episode -- and killed it.

Crystal Bowersox: Click to watch
Simon Cowell called her version of "As Long as I Can See the Light" by Creedence Clearwater Revival "amazing" -- and said she had the potential to be another Kelly Clarkson.

Elimination night is tonight -- we're guessing she's safe.

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