It's hard to believe, because it seems like she's been around forever, but Lexi Thompson is finally 21. She celebrated the big day by getting her hair done, and we're celebrating with a look back at her wildly successful career, especially for someone just entering their prime.
Thompson first broke onto the scene as a 12-year-old at the 2007 U.S. Women's Open, at the time she was the youngest player ever to qualify for the event. Since then she turned pro at 15, and held the record for youngest to ever win an LPGA event, until Lydia Ko came along.