CNN dug up some amazing vintage footage of Jen at age 14 performing in Shakespeare's Othello, where she sung live on stage as Desdemona, and she sounded great.
Her hometown drama teacher recalls that J. Law as a teenager was "precocious and energetic."
"She had to sing a cappella and that's not easy to do and a lot of kids will shy away from that," he explains. "That doesn't surprise me that she had the courage to do that because she was determined and unflappable."
Hit the clip to hear her voice and find out what her first ever role was!