Jessica Simpson just won Throwback Thursday, forever.

The singer took to Twitter yesterday to share an epic video from her teen years -- a clip showing her performing "The Music and the Mirror" as Cassie from "A Chorus Line."

And while her voice is impressive, wait until you see her start some crazy dance moves around the 1:55 point.

Check out her twirls, backbends, splits and turns! 

We're guessing this was from her high school, which she dropped out of in 1997 to pursue her singing career. FYI: She did receive her GED later.

Click the gallery below to see more celebrity yearbook photos!

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