Watch Steven Tyler Finally Perform "Dream On" on 'American Idol' Finale!

Steven Tyler should have performed at the beginning of American Idol's season 10 instead of the very end, so he could have shown the contestants how it's done!

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American Idol judge Steven finally took the stage in his appropriate performance attire to rock out to "Dream On."

Jennifer Lopez couldn't contain her excitement and was bouncing up and down during the song.

Steven started the song on the piano and then moved on to his screaming vocals to wrap up his performance.

Do you think Steven's still got it?

We wish just a little bit that contestant James Durbin would have joined him at the end!

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Watch the performance, below!