"Dear all. Cut my hair off a few days ago... Feels incredible. I love it," the 20-year-old wrote. "I've wanted to do this for years and years; it's the most liberating thing ever. Hope you like."
Watson's drastic new do comes just weeks after filming wrapped on the final Harry Potter film. Harry Potter and the Deathly Hallows will be split into two parts and will hit theaters on Nov. 19 and July 15, 2011.
Watson is about to enter her sophomore year at Brown University and is also a model for Burberry.
What do you think of Watson's new haircut?